I'd have to say the auction results aren't really a valid way of determining what you should sell or buy a machine for.
Afterall, the final price is what it's worth to the winner that "bidded hard to get it".
Some titles may invite excessive bidding (i must have it) as opposed to machines that only get 1 bid.
Probably the better guage of 'value' would be all the buy-it-now auctions, where it can be shown what machines really go for, and which ones dont sell for the (high) price asked.
Even then, people with money wont care whatr the buy-it-now price is and buy it regardless....doesn't mean that pinny is actually worth that price.
At the end of the day, the pinny you're looking at online is either worth it TO YOU, or not.
Anyhoo....