It's yours now so you can do what you want with it. You were generous enough to actually do work on the quilt and buy raffle tickets so there is no need for guilt. However, I do understand that you don't want to raise your friends' ire. So sell it if you want and if anyone asks about the quilt you just say you passed it on to a very appreciative person. They don't have to know if you sold it, gave to friend or donated it to a charity.