Sorry but it's exactly the same as reducing the max bet, except it's pretty much lying to the gambler.
Winning big because of luck has to be possible, otherwise who would want to gamble?
Will not prevent anyone to win 100 btc betting 1, with a smaller percent of chance. But it is stupid to keep a high max profit.
Imagine that the bankroll is 30k btc, and max bet is 100%. Someone will 1 million btc could easily win the 30k btc with a high probability, almost 100%....
Investissor's money should be safer.
Most of the real casino are making crazy money every month and are not in a negative profit after a couple of months