I can't be 100% sure on this. I've had my Intertops account since way before they start "limiting" US players. But I would think that if they let you create an account, that you shouldn't have any problem playing on it. If they let you play, and you win, then I can't imagine why you would have any problem getting paid.
I haven't been playing on Intertops too much lately, since they seemed to kind of go the way of Carbon Poker with so many of their tourneys being re-entry tournaments. I don't really care for the gimmicky formats. I don't mind an occasional turbo or bounty tournament. I do, however, prefer to play straight forward "freezeout" tournaments with decent level lengths, that tend to favor more skilled players. Frankly, I don't see enough of those on the schedule anymore.
Good luck to you, though. Who know, you might just see me on the felt there.