I have. Multiple times. I've had my arm X-rayed and examined by like a trillion different doctors and everything seems to point in one direction; namly exhaustion and poor ergonomic circumstances, such as a too tight grip on my pencils and the like. I know it does sound bad when I talk about my arm, but I actually isn't THAT bad. Though the on-and-off pain and exhaustion is still enough to kill off any inspiration or will to draw or write...
I draw by using a bandage to eager the pressure, and that's probably my life-saver! So no worries there.
I'm not that good of an artist.
It kind of sounds like your getting carpel tunnel syndrom. That can actually be caused by overusing your hands.
I like the idea, but I agree with some other folks that 15's a bit much (I barely have 15 myself

). Maybe 5 posts. You could get that in a few hours.
15 posts will take at least a day or two. Which is either gonna drive new people away or cause them to spam bullshit.
A person could get 15 posts pretty easily I would think. A person could easily get that many posts in about 20 minutes or less. If they post in the off topic section they could get 15 posts in a few minutes. If it starts turning people away though I will definitely lower it though.
Sadly, yes.

I have had some problems with my right arm (the one I draw with), as it gets really achey and/or tired pretty easily. I've had it ever since spring last year. I let it rest for a while, but the stupid pain showed up again in late autumn. This state is still pretty awful though, as I'm currently enrolled to a comic art program in university, as I'm not able to put as much work into some works as I'd want to, and some things I can't even do at all. it also comes and goes in periods - some days I'm all fine and dandy, other days I have to eat painkillers. And when I actually feel good in my arm, I usually spend as much time as I can drawing, because that is the thing I love to do most in my life, so I don't have much powers left to do some fangirl rants here, even if I'd love to.

That really sucks, especially since you are a artist.
The only good thing that comes from this arm problem is that I'm slowly but steadly turning ambidextrous - My leftie's WAY better maneuvering the computer mouse than my rightie ever was, and some of my classmates have commented on my (made only for teh lulz) leftie-scetchies that they can't tell the difference between them and my "normal" doodles, done by my right hand.

Well if you can write with your non dominent hand then that really helps. I can't even write my name with my non dominent hand.