Take Dicebitco.in for example. It was caught skipping winning bets. In this way, the house edge ended up a lot higher than the advertised 1%
After it got caught, the owner started betting himself through an alias winning everything and clearing out the investor's money.
Ya that was for sure a dick move.
Note that a couple other 'riggers' have faces consequences.
Butterfly labs from what I've read, and also the pireat40 dude. And there's always the risk of messing with the wrong people. Staying honest is always the best way to go about it, imo.