I forgot to mention - one of the best things about using a sniping service is that you won't get sucked into upping your bid past your "maximum." When you sit there watching it until the last minute its possible for someone to come along and bid it up past what you had thought would be your max bid. But because there is still time left and everyone has at least a little bit of a competitive spirit its easy to convince yourself into bidding even higher than you had ever planned on.

When you set up a snipe, you usually ignore the auction until its over. So there is much less opportunity to get caught up and make a rash over-priced bid.