Black Box trading

Im curious as to why there are so many ECN bids/offers well away from the inside that cancel if the market gets close. I assume these are boxes because of the way they flash
We all know how nice and predictable these programs are, but why build one that only cancels if close? I understand guys want to be first at a much better price if the best bid cancels, but what about the bids behind them canceling and flashing
 
Quote from RNRBAND:

Im curious as to why there are so many ECN bids/offers well away from the inside that cancel if the market gets close. I assume these are boxes because of the way they flash
We all know how nice and predictable these programs are, but why build one that only cancels if close? I understand guys want to be first at a much better price if the best bid cancels, but what about the bids behind them canceling and flashing
You must be talking about a polka dotted black box.
 
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