I would want to know where he is going to sell the quilts and for how much. Sounds like he might have his head in the clouds. How many of us, when showing a hand made item to someone, have heard "Oh, you are so talented, you should open a store."
It's not that simple. Selling quilts is tough. Does he have a retail outlet already or is he going to sell them to stores. I think I would say, "you can pay me X for my time, then you have the quilt to do with as you wish."