Quote: $500 in a donation drive and bought a game and dumped it and resold it for $350.
Is it possible someone knows you are bidding on a board and inflates the price?
Why are you buying boards and selling them at a loss in the first place?
You should be keeping the boards, as you are backing up the dump via DMCA i.e. you are creating an archive. I thought the MAME devs use these boards to learn how to emulate the hardware.
Selling the boards just trashes that ideology.
Can you see the implications of what you are doing?