You've never seen auctions with an BIN option, that get bid up past the original BIN price?
Example, game with $19.99 starting bid, $29.99 BIN option.
I want it, not sure what I want to pay. I wait until the last 5 seconds to bid, to hide my intent. I can come in with a $29.98 max bid and probably win it 99 times out of 100, for closer to $20 than $30. Why? Because everyone else viewing the auction assumes it is not worth $30, otherwise the BIN would have been clicked already.
Or, I could just bid $29.98 on day one. Anyone else viewing the auction late doesn't even know the BIN existed, and just see my bid showing at $19.99. If they want it, they can push it up as high as they want it to go, well past $30.
Please don't argue with me. You asked for an example, I provided one. End of discussion.