> I'm pretty sure the way they make money is to flash out orders and see if there is a response for the now unavailable security No. Market event A is seen to

> I'm pretty sure the way they make money is to flash out orders and see if there is a response for the now unavailable security No. Market event A is seen to correlate strongly with market event B. The correlation is so obvious that multiple participants compete to make the B trade first in reaction to A. It's part of having a healthy market, electronic or otherwise.