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Jim VBI did too David, for a long time. The thing that tipped me over the edge was the seller's use of Turbo-Lister and other such programs. For someone who is a set collector (Guilty!), I sometimes see a seller list a string of 20-30 cards that all close within 4-5 minutes. You can't manually snipe that many items, that close together.
A snipe service lets you select which ones you want. Enter your bid. And they do the work of the rapid timing.