If we have enough capital, maybe the easiest way to make a living in gambling is just to start our own casino or gambling sites
Nowadays, it is no less a daunting task than winning in such a casino
If you follow the Services section of the forum, now and then you see new casinos entering the spotlight and recruiting forum members to post with their signatures. After a few weeks of advertising most of them disappear to never to be seen or heard of again. What does it tell us? I guess that the competition in the field is extremely tight up to a point of brutal, and even if you have enough funds to start it off, it doesn't mean you are going to succeed as you also need a lot of expertise in, for example, running a business
I agree with your statement, capital is the most important when running your own casino but it does not guarantee you success since the competition is really tight. Those old casinos are dominating in the market because the competition here is based on how reputable your casino is, and usually a new casino has to build their reputation until they will be able to attract more gamblers are grow.
Running a casino is also a gamble, actually a high risk as well as you need big amount of capital to build a good casino which you cannot ensure you'll succeed.