Hey, and welcome.
Actually, quite a few folks give stuff away for free and make money from it. Also, you could consider posting low-res or partial versions, so that people who want it printed or hi-res pdf or whatever would still have to buck up.
There are some other pro people around here, I think some of them are indie publishers. GamerPrintshop, for example. They do a lot of sharing, and from what I can tell, don't lose much from it compared to what they gain.
Besides, we'd love to see your work.
Once again, welcome.