you have to watch things like this
i tried using one about 5 years ago, and it bid on loads of stuff with "key words" after i lost one auction,
the best way of sniping an auction is to wait till the very last minute to bid, dont bid on it at all till about 30 seconds are left then bid you maximum..
youll notice that most bids are towards the end of an auction, and people are willing to pay whatever people are willing to pay, the bids on 10 day auctions are amusing, people will bid up the items on day one, say a xbox 360 starts at a penny:
someone bids with a penny, afterall, a penny isnt much! the bidding will go up one step at a time, but these bids are relatively pointless, this item is worth about �300, and will sell for quite close, as many many people are looking on ebay for one, so.. the first bids upto about �200 are completely irrelevent, its the last few bids that matter..
people will look through, and mainly ebay is set to show the items that finish soonest, so, with that in mind, people will look for the first available xbox and bid on that,
even a �20 saving on the shop price is worth commiting an hour to buying... so everyone will sit and wait..
basicly what i am saying is, you are always best to wait till the last 30 seconds of any auction to bid.. if i want something, i bid at about 5 seconds to the end of the auction, and i bid the most i want to pay, on one bid..
other people will be bidding on the most saught after goods in this fashion, and no "sniper program" will give you the advantage...
it simply bids what you tell it to, at the last second, if you arent around for the last seconds of the auction then it could be useful, but as ebay is a stratigic market, proffesional sellers will list things for target audiences, ending specific times on specific days...
ebay is a science.... complicated