The minus time wouldn't work. You might be left with auctions with no bids. Sniping is usually a problem for other buyers. As a seller, if you are selling something in demand, the price will go up regardless or last minute bids. In the end I don't care when the bids come in as long as it sells of a decent price.

As a buyer, I always snipe. Always. However, I always bid my maximum bid amount with the snipe. The same amount I'd have bid if it had been on day 1 or 2.