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Marc S.Sellers can very easily dissuade this happening by having higher BINs or reserves on their auctions. Especially if they are setting a very low opening bid simply to avoid Ebay listing fees.
I have often hit the starting bid on auctions where I had no clue what the final bid would be -- but in doing so, I ended up killing the BIN. Sometimes I win the auction at that initial bid.
This is not a required form of Ebay etiquette. In reality, sellers can easily manage around this happening if they so choose.