Q. Why doesn't eBay implement a Sniping feature?
A. That's an easy question to answer. Because they already have one.
They call it "Proxy Bidding". If a person wants to win the auction without a bidding war, they bid the highest amount they are willing to pay the first time. Then they can walk away knowing that if they get outbid, then the other person was clearly willing to pay more than them. If they win the auction, then they only pay the minimum amount necessary over the next-highest bid.
What this means for Snipers: If you come in at the last second and the bid is sitting at $50, and you snipe with a bid of $55, you may still lose, because the proxy bid may be set at $60 or $70, or even $10,000.
eBay's proxy bidding system will always outbid any sniper who does not outbid the proxy amount. In that sense it is the ultimate sniping program.
Oh, and this isn't a new feature. It's been around for years and years. I started using eBay in 2000 and it was part of the system then.