Methinks you have not really studied the model of sites like clubwpt.
A free roll is hardly free if you are paying to enter it.
Also, these sites are not legal in the entire US. As they base their play on a "sweepstakes" model they must comply with the sweepstakes laws of the feds and the 50 states. You will note that no site accepts play from all 50 states. There are also some unique state laws that work against these sites (laws like "it is illegal to play cards for money").
If you want more information and advice on this I charge $250 per hour and expect at least $2,500 as an upfront retainer.
Skallagrim