Theres a Super Mario that keeps getting relisted on Ebay... seller wants $4000 for it.
Now were anyone ever to buy that machine at that price and then tell me, i would feel obliged to inform them that they were bloody bonkers.
Often i have gone to look at a machine with a view to buy.. what greets me is a run of the mill 70's Williams EM game sitting on a back deck exposed to the elements. Seller then informs me that these things are worth thousands as he has seen them on Ebay for $5000 - $6000.
Can honestly say ive never regretted NOT buying one of these.. 
I think I've seen that one on there, I've actually seen a few and boy have they been of average state, absolute worn away playfield's
