I'll probably be participating in your promotions. Looks good at first glance, and the site seems to be very well designed. Some errors I think you made:
As the MoneyPot Bankroll grows, so does your stake in the bankroll!
That is not true - as more people invest, your stake becomes lower (unless you mean people losing BTC)
Is it one ticket per person, or one ticket per 100 bit bet? Also, could you use a provably fair method for picking winners for the raffle, like using MP bets or block hashes?