I agree with you (just donate and don't look back), you'll only get angry and feel ripped off. So my question is, what's the point of this post?
You donated the quilts for a charity, they were sold and made money for the charity and no doubt made so child very happy.
Sounds like you performed a good deed, then you had to spoil it by venting here because they didn't bring as much money as you thought they should.
We often vent here about circumstances that frustrate and anger us, and that's fine, but in this instance I think your feeling is selfish. I'm sorry - just my opinion, others may disagree.
I hope your charitable experiences in the future are more to your liking.