As Joe states - all snipe bids entered will be accepted.
The only way the seller loses out are if all bidders enter low snipe bids thinking that no-one else will bother, and then they have no chance of increasing their bid.
I always snipe the highest amount I am willing to pay, then if I get it cheaper it's a bonus.
Sniping gives the buyer the advantage of not revealing their interest in the item until the final dying seconds.
Some bidders may have a high success rate of finding hidden gems.
If they bid early on in the auction, then it is possible for other bidders to find out what they are bidding on, and thus find items that otherwise, may have attracted very few if any other bidders at all.
There are bidders on ebay who will follow these bidders activities, and then bid against them.
Sniping prevents this, as the bid is only placed in the dying seconds, which therefore does not show in the bidders bidding activity until it is too late.
In this instance, the only way that the seller loses out is if they have listed the item in the wrong category, made spelling errors, or not used key words to attract bidders.
That's the beauty of ebay.......