Are sure what you said above just a calculation or anytime you did it? If it is so easy to double our money in one or two rolls then by now most of the casinos should have been closed already, and all gamblers would be wealthy. It is not so simple like you think, and it is tough to make money in gambling. If you bet more then more fast you can lose your money also so, I believe that it is not a good idea to become rich by gambling method.
Maybe he's just a risktaker and luckily won on here first attempt, but the fact it is the most riskiest thing you would do and possible you can lose big on simple mistake you can do and totally it can make you cry since luck is not always behind us, so better dont bet bigger more and we must enjoy the game since gambling cannot make rich we cannot get a life our wealth with it.