Hi Chancecoin!
I am just learning about the protocol. So right now the random numbers are coming from the State of New York? Couldn't hashes of bitcoin blocks be the random number / random seed for all bets over a certain size, hashes of litecoin blocks could be for smaller bets, and hashes of dogecoin blocks for the next size down. Perhaps even something like Fastcoin could be used to decide micro bets.
It wouldn't just be the size of the bet that mattered, but the total amount of all bets placed would have to be capped for each pool (bitcoin, litecoin, etc.). The amount of money at risk for each block would have to be less than what someone would be willing to alter a blocks for.