Sniping works in auctions were the bidders do not unconditionally bid the max that they are willing to pay. Because their bidding is conditioned on how many previous bids there are, the starting price, etc it is best for the sniper to hold their fire until the last second to avoid provoking a bidding war against these types of bidders.

A mass of bidders like you, Little Darwin, are the bane of snipers Because your bid is not conditioned on anything besides what you are willing to pay, the auction time, start price, end time of the auction, how much money there is under couch, phase of the moon, etc etc cannot be used to the sniper's advantage. Fortunately, many bidders aren't as smart as you, and this is why sniping works