PurePlay.com is really clever :)
So it looks like what they've done is structure the poker as a sweepstakes, in order to pay out the $100,000 per month in cash prizes.
However, to be a sweepstakes you have to comply with those laws which means there can't be any "consideration" required to enter the sweepstakes. I actually studied this topic before. So PurePlay complies by offering free entry by postcard to the same tournaments, which means you should be able to win without doing anything else too.