I do something similar. I offer a quilt exchange for any recipient of a quilt I previously gave them. They can exchange one they have for one currently completed. I take the one that they "turned in" and donate it. I have had a few "bidding" situations , as occasionally two people want the same quilt. I have no issues that they are willing to part with a quilt I gave them previously, as I would rather have the quilts I make get used. I am happy they aren't sitting a on a shelf, they are happy they don't feel obligated to "store" a quilt they no longer want to use.... for what ever reason.