If I sell a bow, it's with the understanding that if the purchaser doesn't like it, he is free to return it in the same condition I sent it to him, for any reason whatsoever. Also, if I trade, I stipulate that if either of us isn't happy with the trade, we trade back.
I have had two come back, one was mismarked as to poundage, and the other guy just didn't like the bow after he got it. Certainly no problem, and I've never had a problem here. All of the guys I have dealt with are honorable men.
I have only encountered one weasel, not on this forum, and I gave him a bow through a friend to find a kid to give it to, and he sold it on x@*+!