I'm interested in putting up a contest here in which I'll give away a free logo design, and several free copies to a video tutorial site that I own.. The design is well worth it and each copy I sell regularly at $50.00 - My question is, is while I read the forum announcements which mentions no advertising except in the marketplace, the marketplace mentions "Buy or sell services such as...", and I'm not selling anything, I'm giving it away - though I do understand it is a form of advertising.
It would be just some sort of every X post contest wins, and I know people like free stuff

. But I just wanted to ask before I did anything that was indeed prohibited.
Thanks!