Actually, I've been selling my work around webforums for almost 4 years now. I barely work for money nowadays, since doing gfx is more of a hobby for me now than a money source, so I just made his sig for fun and to kill some time.
But you may understand that it's disappointing to see someone taking advantage of your goodwill like that.
Also lol, I got 6 messages of people wanting work done, only from that sig. I'm not going to reply to everyone, but I'm saying here that I don't have time to do any of those. My bad.