There are 1000's of trades that occur in that second and not only HFT. Someone will benefit if they just happen to cross the spread in that .1s. If you are un

There are 1000's of trades that occur in that second and not only HFT. Someone will benefit if they just happen to cross the spread in that .1s. If you are unloading 10,0000 shares the speed arbitrage could save you real money.