I'm willing to bet the pay musicians get now are based on the area you live. In my area of the US the pay hasn't changed much playing in bars. The pay for original bands are bad too. Depends on the bar, the crowd you draw, and if the drinking crowd is still around. I know with the change to many drinking/driving laws that hasn't helped either. I'm not thrilled with what's happened on the music scene. Only a few bands are making money, the rest are just treading water.   

From my experience and talking to peers, the pay at the upper end of the industry hasn't changed much in ten years either.
I don't know if it's a factor of age (I don't know many 20 something's in the industry) or everyone is tightening their belts. I suspect the latter, but could be proved wrong.
But in my experience, which involves traveling around the world and talking to people in the industry around the world, it seems clear the music biz has declined in the last ten years (a slow decline over twenty years actually).

Club scene here is the same ol same ol, not real great. Pay scale hasnt changed in a decade!. To depressing to talk about .

I was going to say that.
I think a few signed bands would be happy with $3k per show too.

We have our own PA and Lights as well, but with the money we're (not) making, we really have to do it ourselves. Loading out at 3AM Sunday morning I was glad to be playing again, but yes, It would be nice not to have all that to move.

Yes, I think changes in bar culture have had an impact on musicians.
Bar owners make more money on food service than they do putting on live music.
Men don't just drink anymore. Couples and families go out to eat and drink.
In my youth, television was a small box in the corner. These days major sports events are shown on big screen tv. People go out to watch sports in bars, rather than at home.
I was playing a regular local bar gig in 2007. You could hear people groan as the sound was turned down on the monday night game so we could start our set. 

I'm happy to be playing again after being out of the game for so long, but I will say that here in southwest Missouri, at least, local live music is just scraping by.  I've talked with seasoned pros around here (in some of the best bands in the area) who say that they barely make enough right now to stay afloat.  It's a cycle that this region goes through every few years.  The local scene will get hot, the clubs are packed and you can feel the vibe around town.  eventually a couple of bands will last long enough to make a name for themselves in the region, and maybe even land a recording contract or a tour or two with a big headliner.  Then things begin to cool off and before you know it, you are looking around wondering... what happened?  So we are in one of those slumps right now, it appears, and pay isn't nearly what it should be.  But this too shall pass.  I'm going to ride the cycle out until things get hopping again, and enjoy it for all it's worth. 
Don't quit your day job.   

What I'm not quite understanding is the line between wanting to make money (semi-pro) and needing to make money (pro).
What other hobbies pay you to cover expenses or a little more?

I guess if I was working a day job Monday to Friday and earning $200 to do what I love at the weekend I'd be over the moon. As I am a professional and only earn money when I play, $200 for two days work wouldn't pay my bills, especially as it would likely be $200 over seven days (the weekends being the most likely paying days in a smaller market).
So, if drumming is your second job or hobby, $100 per gig is GREAT IMHO. If you have to earn a living just from music, $100 per gig is terrible. 

This is a subject that I has bothered me for years.  In the late 70's we were charging $300 a night for the band.  I guess this may very depending on location?
Anyway, what bothers me is that here we are, 30 years later and clubs still try to get entertainment as cheap as possible and get away with it.  As long as there are bands willing to play for nothing, it is hard for bands to get anymore.

  I ain't doing it for free anymore unless it is for a good cause like the Concert I am putting together with 4 bands in September for a Cancer Charity Fund Raiser. This is really worth all the trouble. There is a big Street Rod Convention going on at the same time. It will be marketed through TV, Radio, News Paper and on the Internet and it is being done at a very nice Amphitheater at a large park.  Great cause, Great exposure.  That makes Free worth it. This type stuff helps to market you and gets your rate up in the future.
Some of the biggest clubs here still want to try to get away with paying the band, $200 a night and use our equipment.  If you don't take it some desperate band will, so I basically say that they can have it.  If the club has their own PA and lights, anything less than $100 a piece ain't worth it.  If I have to haul and set up my own PA and lights it will take $150 more. This is called work. For a 3 man band, that is $450 a night. My guitar player has a steady house band gig with a country band, one night a week.  He walks in with his guitar and plugs it in and make $80 a night.
That is worth it.  He doesn't have to even carry his amp. Just plug in and play.
 Each gig is different. I would charge more than that for a Reunion or Wedding.
A wedding or party for a close friend might be different.
  I am almost 47 years old with a good job and family.  I am not going to wear myself out playing everywhere for nothing.  I would rather play a few quality gigs than a bunch of gigs for hardly nothing.
                                  Nutty

Chris,
My band has averaged 2 practices a week since last summer. We all play music with other people too. I was doing three bands for awhile and Church and practicing on my own. It was a big strain on my family. I cut it down to the best band and church and practicing on my own.  I am behind a drum kit enough for my taste. I have heard pro level bands at Rupp Arena which seats 24,000 people that couldn't play as well in some cases as this band.  Now, who knows, maybe they were all standing up there drunk or high, or maybe they hired some sound person that just wanted to ruin their sound?  But they sounded like crap.
Just because a band plays all the time doesn't make them great. At an open mic gig,
 I had a band ask me if I wanted to try out for them. They had seen me play and they had fired a drummer that was a friend of mine.  They were playing gigs all over town so I asked them when they practiced. They told me they knew almost 500 songs and didn't need to practice.  I watched them play three songs, and they asked me what I thought.  I told them that I could tell they didn't rehearse together and I wasn't interested.
I have a bunch of respect for Pro level musicians.  I am friends with a few of them that live here and are either doing it now or got out of it because of burn out.  I have no desire to go on a tour bus and make the same kind of money that they were talking about and be away from my family. Not worth it. We have to all make choices for ourselves.
 
I think the truth about making the money is that you have to walk before you can run.
The guitar player that I work with at church has been a pro level musician all his life.  That is what he does, with a few other good investments he has made.  His band has been together for over 30 years and is able to demand more money than most, locally. He also plays with two other bands that are newer but are loaded with experience.  They will be doing the Charity Fund Raiser for Cancer Concert that I am putting together. In organizing an event like this, I have made invaluable contacts in the best clubs and marketing contacts in the area.
Doing the right gigs for exposure purposes and getting your name out there with the least amount of work is what I am all about. Meeting the right people is everything. Not playing gigs 5 out of 7 nights a week. If someone wants to do this for a living and make it their only job, at the rate of pay locally, this is what they have to do to survive until they establish themselves as a big ticket. Not my game . If I was single, I might see things differently .