In this world there are only a few percent of gamblers who are able to build their wealth from gambling, this happens because they have good abilities and are also able to maintain a balance between their wins and their losses. i once met an active casino player, he only played casino every day, he would stop for a few hours if when he played slots, he lost 3 times in a row, that was his trick and it was proven that it could increase his gambling winning percentage. his every day is quite high, from him i learned about how patience can make someone profitable and win, he said good timing is the key to being lucky in gambling.
Even with a huge capital one could loss his entire capital in a brink of an eye. That's why proper time management, fund management, limiting gambling activity and bets, being a responsible gambler are the key components if anyone wants to minimize the losses in gambling. But these are never enough. The last main thing that is needed is luck, without no question.
Huge capital is usually required in business and not in making a career. Making a career in gambling by doing gambling is insane thinking and i am sure anyone who has been gambling for some time, knows the fact that only luck is the main factor that makes the gamblers successful and no career and business can be built on luck only.
Yes, if you have a lot of capital, why not open your own casino? This is the only possible way where one can get a grantee income but remember, it will require a lot of capital to start such a business and also experience of running a casino also matters a lot.