It's worth pointing out that the HFT pays robinhood $.02 to receive the order, and then may or may not fill the order at <= $10. These are separate happenings,

It's worth pointing out that the HFT pays robinhood $.02 to receive the order, and then may or may not fill the order at <= $10. These are separate happenings, and robinhood does not ever receive part of the variable price improvement. Edit: And it is possible for the HFT to lose money when doing this, if they pay the $.02 PFOF and then pay the same price as the market.