Snipers can outfox themselves sometimes. Depending on the item (and when it ends) I try to put my maximum bid in about one minute out. I have won some auctions just under the margin of my maximum bid from a sniper who if they had the time (and were watching) would have snapped to the fact that they could have had the auction with one more bid with just the next increment. If someone bids in that minute (and is under me) I will sometimes adjust my bid a bit to just go over whatever fraction of a dollar the person is using in case they bid again (assuming I have time).