~snip~
Not all gambling is all about luck, some of them has more to do with other things than luck because with the right skills that some people have, they can make use of it to make money from gambling. Sport betting isn't all about luck but also experienced because after knowing more about the teams playing,you can make correct predictions and not only depending on luck but most people claiming to be living off gambling are actually lying but there are some people that can be lucky to be living off gambling effortlessly. Some people are very lucky that anything that they're doing, they'll be winning while the rest of the others doing the same thing aren't being as lucky as they're getting. I have heard of people that have won the lottery multiple times and with that money they can live comfortably for a very long time.
All gambling has to have some random element to it, otherwise it cannot be legally considered gambling.
That means that all gambling has luck involved, and also all casinos put their own odds, which of course they decide to keep them to their advantage.
So, even on sports betting, where you might have better odds, the chances are that the casino will win more money in the end.
Even if you have inside information from one event (which is probably illegal anyway), the casino will eventually recover if you keep gambling. And that's assuming you win in that insider's bet, which you might also lose.