You may have a point about "bidding up", as I have noticed the same users bidding on some items on online auctions, sometimes increasing the bid by a ridiculous amount. On one site, I'm almost certain that one user id belongs to one of the people running the auction site. But this is an age old auction practice.
You see such a 6.9 sell for big money, but yet great cars for much less sit unsold, so it is strange. Unless some of the "big fish" prefer auctions to dealing face to face with buyers in the real world.
I did see that 350SE and was going to tell a mutual friend of ours with a similar, low mileage 350SE. If he hasn't seen it, it will make his day!