getting into the us is tough... with so many applicant to choose from why bother.. But once you're in i think the deportation stuff isnt a real risk. Deporting people is a hassle, and even if u manage to do it many people ignore the deportation order anyway.
That being said we got enough problems in the US without foreigners coming here and robbing some local businessman trying to make a buck.
I know for one i would never go to a foreign country and start ripping off the locals.. takes some fucking balls. Maybe the US is a little too nice to these guys.