Some good points have been brought up so far.
I agree that some sellers seem to deserve the smackdown based on their tone or mislabeling things as "quick sales". I've written responses for some of those reasons before, but deleted them before posting. Maybe that feedback is deserved, but ultimately I didn't think that was the place for my comments.
As for helping the other buyers, I can see where you are coming from but why would someone buy anything without checking the going rate first? That astounds me, but I guess it does happen.
Collecting: money in the bank