One makes a investment to be an artist - time, and certainly money. Materials cost money. At some point an artist has to try to recoup his investment or his career will be very short-lived (unless, of course, he has an alternate stream of income). I would advise my fellow struggling artists and those just starting out to be very cautious in giving away works of art. I am not saying it cannot or should not be done (sometimes it can lead to sales), but don't sell yourself short, and keep in mind that you have to recoup production costs at some point!