thready,
Do you abhor "shillers" or "snipers"? Because those are two vastly different things...
If you did mean snipers, then WHY do you hate them? All they do is drive the price up, which is what sellers generally desire. "Nibble" (i.e., inexperienced and/or inefficient) bidders can always play around with a bidding war all along, if they want to, but the sniper will still drive up the price at the end.