If someone which follows the set of rules and be discipline enoff. Can people make 50-100 $ a day just gambling in online casino.....?
If the game is on the big bets then of course you can win. But you need not only to be a good player, you also need to be able to play well. Although the best advice is to choose in what understand.
It's not about discipline alone, remember that casino's are popping up so fast and there is a reason why that is happening...PROFIT
Their most important goal is to make profit and lots of it. That's why you can see them winning all the time, not because the game is rigged, but the odds are in their favour.