At a school auction once, I offered a classroom sized pan of brownies (12" x 18") with frosting and candy of the class' choice on top. It went for $5 and cost me about $20 to make. SOOOOO....the next year, I offered the same thing but insisted that the minumum bid had to be $20. It went for $30. BTW---I had about 30 minutes of time in each pan, nothing like a quilt! I'd say that if you donate a quilt, stipulate a minimum bid.....