I think the main reason the idea dies is that this board is run by Axiom and they end up liable if there are any problems. Apparently buy/sell boards get sued on a regular basis. Ebay has teams of lawers; the forums claim "hey, we don't have any assets, sue us if you like", but Axiom doesn't fall into either of those camps.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8