Oh, there are several that have a "If you paid for this..." warning. Anime fansubs have this as practically a requirement since so many try to sell fansubs. The problem is that they won't be seen until after money has changed hands. The real question is informing people before the damage is done. Since a lot don't use custom covers, and instead that found in Rikter's cover batch, I'm thinking adding notes to the cover might help. Anything from a subtle "Distributed for free at..." that the seller might miss, to a more obvious "FREE FAN PROJECT - NOT FOR SALE" in big, bold letters up front. Though that may be too obvious, and hence make the cover unusable. Basically, if it could just be better expressed, it might help. Wishfull thinking I know.

Shame this is so under the radar. It's not like we can report them to cons either. "He's selling bootlegs of a fan bootleg." ^_^ Maybe leave off the last part.