Anyone familiar with, or use:

http://www.auctionsniper.com/
or
http://www.bidslayer.com/download.html
or
http://www.ezsniper.com/


Usually, if I find something I want to buy on ebay, I put in my max bid and forget about it until either I win or loose.

However, I notice a lot of the bidding against me is by a single person who puts in multiple bids, and has not purchased much in the past from ebay.

This is usually due to one or two auction pscys coming out.

a. somebody else thinks it is worth more,so I'll bid more or

b. well, I offered x, so I guess I'll try x + $5.

and of course
c. they have no idea the value of the item, either in the real world, or to them.

I usually don't much mind, as there are usually more of the same thing coming down the line, however, this item is serious money by my standards(around $20,000), and I would just a soon not have idiots bumping the bid up for days at a time by $100s.