every organization that deals with volunteers walks a fine line keeping their voluteers happy. a donation is a gift given voluntarily. you don't have to, and they need to be aware of that if they aren't. they depend on your willingness to continue to give of your time and skill and materials in the form of quilts. if all it takes is an acknowledgement it is shortsighted and foolish to the extreme for them to overlook it. it does make you wonder what else they are overlooking. still, it is a harsh climate for non-profits and many will go under for lack of donations and workers. i would say if it is a cause dear to your heart, make it as easy as possible for them and cut them every bit of slack you can.