They have probably already done simulations to figure out over the long haul how to screw the public through HFT.
Joe Saluzzi is always insightful but he has admitted lately, that he doesn't know what the solution to flawed Market microstructure we have today.
What there is now is a collection of symptoms. And for the most part, the doctors.. i.e the HFTers... have more money in keeping the patients sick then healthy. Think how many risk management systems are getting screwed into putting on losing positions to offset risks that are manufactured, or on the other hand, inherent risks in the Markets are painstakingly hidden by HFT so that the institutional trader gets faded every which way - on his entry, his exit, his position, and his ability to hold on during episodes of volatility. You definitely have to know how to trade extremely well to survive running money given how much tougher Markets are these days. But the funny thing is, only a few people from institutions actually care. It's sad really, its like they don't care if they lose money. I guess thats what 3% management fees do to you.