Like everything, you just have to decide how much you are really willing to pay, and put in that amount.
Sniping merely ensures that you will get your best offer in at the only time it will accomplish your goal - the end.
In a live auction, everybody is yelling and trying to outdo one another until all but one give up in exhaustion.
In a silent auction, the only bid that matters is the one that is highest .001 second before the bell.
If you are only willing to go $100 and someone else will go $101, you will lose, in any case, everything else equal.
But if that $101 guy is only in for $90, just before the end, and you can get in at $91 before he can respond, you win at that price.
True, a "real" ebay bid goes in after all snipes, so if you REALLY want it, you need to put in a sky-high ebay bid and blow everybody else away.
Sniping guarantees you get your best shot at your selected price point. No more, no less.
It is faster and more dependable than human fingers, costs only pennies, and even then, only if you win.