I don't mess about with sniping software. I just put in a max bid of what I'm prepared to pay, and let the auction continue normally, as is the intention of auctions. If I win, by definition I'm happy. If it goes over my max, I don't want it at that price. Why would I want to snipe?
Sometimes, folks go bananas and pay way over the odds - I've seen second-hand items go for substantially more than a new one would cost. I've also had some stunning bargains.
I bought a new cellphone recently - a Motorola V3im. The first one I bid on was at £80 five minutes before the end, and went for about £160. Two snipers had overloaded their magazines, I assume. I got mine for £60 plus P&P - 3 months old, unused. I suppose the snipers didn't find it.