I was going thru and adding all my snipes, and I pasted the same Item number (by mistake) and AS created duplicate Snipes for the same Item Number....I think you should either stop the user or give a warning.
There are certain people who set up two or more snipes per item. This allows them to snipe a lower amount with, for example, 10 seconds remaining...and then come in for the kill at with a higher bid with 2-3 seconds left.
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