Sniping.
When I put stuff on ePay, I elimate sniping by placing the opening bid roughly at market price. A seven day auction is really 6 days, 23 hours, and 59 minutes of advertising, then 60 seconds of bidding.
Example, if I were to sell my copy of Xracula D, I would put the opening bid at $100. Right now, probably won't go for much more than $125, unless there is some caveate like a "where are they now" showing up in a magazine somewhere.
The key for buyers is knowing the market. Don't kid yourself. Nothing says you deserve the item more because you've watched it since 30 seconds after it posted, or because your the biggest fan of (ITEM) since the third grade. If the market says Xracula D is worth $125, it's going to sell very close to that. I don't care if the auction is at $35 with 2 minutes left, the game is going to sell for what the market bares. Anyone who pays more than market for a game (or anything) isn't very smart with their $$$ and will probably be putting that beast back on ebay the next time their car needs brakes or they go over on their cell phone minutes.
On a personal note, I never bid more than I'm willing to pay for the item. That elminates me getting all krunked if I loose an item with 4 seconds left. I'm more pissed if I get caught up in bidding and spend even 5 bucks more that I was originally willing to pay. I've never heard of "not winning an auction remorse."