Every sell is someone else's buy, and every buy is someone else's trade. If you saw a bunch of activity happening milliseconds before it should, why would you be the other party to someone you suspect is committing fraud? You will be the primary victim of the fraud.
The question is who gets to do the fleecing of the rubes.
So if someone did figure out a way to play the system and get it a little early that's interesting... if someone on the inside is playing fast and loose to make sure the right people get first crack at any small orders that happen to have been left in the system, that's a problem.
But, yeah, it shouldn't be super big bucks at stake...beyond some small initial volume, anyone you're going to trade with is going to know what's up.