if gambling on single bet is that reliable why not many people becoming a millionaire or even resigned from gambling because they could have ended up accumulating the amount they wished to have in their possession.
many people becoming a millionaire or even resigned from gambling is because that it not the way that the system is designed. It is designed to be against you- you must have heard that the odds are not in your favour and that is it. If the reverse were the case, there would not be any casino to bet in anymore because, every day they are making people richer while they go bankrupt. That is not the business model.
The business model makes it that you are likely to become a millionaire faster if you are high roller or you bet more but it is an illusion. Just bet for entertainment.