If I have the opportunity to donate a quilt for a fundraiser I do it. Does not bother me if the quilt goes for less than I think it's worth. I figure if someone is going to pay something (anything) for a quilt, it's because they want it and at least it will be used.
I used to donate all of my quilts to organizations that distributed them, until I started seeing some quilts that others had made and donated, in some local thrift stores. It made me sad and discouraged. Don't get me wrong, I still donate some quilts that are not fundraisers, but it's not nearly what it used to be.