Whatever you do never ask someone how much they think is fair to pay for a quilt. I did this once. I made a Harley Davidson bandana quilt --probably spent an easy $150 on bandanas before I even purchased fabric for sashing, backing, batting, etc.. It was nicely done and king sized. I made it for a friend's brother and told him to pay me whatever he could.
I got a check for $30.
Lesson learned.