I have never used a sniping service, I like the thrill of throwing in the bid at the last minute myself. Generally though I loose a lot because I put a realistic value on stuff, meaning a hell of a lot lower than msrp as you usually get a less reputable seller (than B&M) no warranty etc. I find far too many loose sight of that and bid right up to and beyond what you can legitimately buy for elsewhere.
As a seller I love sniping, as a buyer it is only a minor disappointment later than earlier when I get outbid or the price moves past what I would pay.
Ebay is totally praying on people and getting them hooked. They are even making it worse now that you can't report negative feedback on a buyer if you are a seller and they don't pay. I reported a non paying bidder through the "proper" new channels they have and completed that process, he never paid, never answered messages and now when I view his account there is NOTHING there to warn other sellers about his past NPB behavior. So now I just delete bids with sellers under ten or so and put in my auction small print that they need to contact me first if under ten. Ebay is playing right into the hands of these crackheads and stringing them along for their auction fix, no way they are going to do anything about it. I fully expect more to be done to support it.