Sniping is a convenience for people who know that early bidding often attracts more attention, 'nibbling' bidders, and results in a higher final price.
It isn't magic, you still have to have the highest bid to win.
Anyone that has a problem with sniping most likely doesn't understand ebay's proxy bidding system, it raises your bid only until you're the high bidder, or, your bid has been exceeded.
Knowing ebay's bid increments is also a good idea for ebay bidding in general:
http://pages.ebay.com/help/buy/bid-increments.html
http://pages.ebay.co.uk/help/buy/bid-increments.html
http://pages.ebay.de/help/buy/bid-increments.html
If you would have bid more if you had time, you should have bid that amount the 1st time. Even non-snipers (don't know why you'd be one) should be happy with sniping, as it forces you to decide on your absolute max, and bid it, or, schedule a snipe for it.
A couple of benefits of sniping that haven't been mentioned:
You can cancel a scheduled snipe if you change your mind or find something better (as close as 5 minutes til the auctions end with hidbid at least). If you placed a bid on ebay, you have to file a bid retraction, something that ebay and sellers frown upon. If you have to many bid retractions, you can be auto-blocked from bidding on other auctions.
Sniping is a way to combat shill bidding (seller or his buddy using a different ebay account to bid on their item, raising their bid until they're the high bidder and know your max, then retract their bid, leaving you the new high bid, maxed out). You can't see it defeats it, but it at least helps against it.
hidbid.com is a good sniping service to use.