Now, if you look at gambling in a professional way, then it gets way more serious, and you might lose a lot of money while not having any fun.
The only thing that you can do is to choose games that have more favourable odds to you, and then use any kind of system that would allow you to be better at the game. Now, of course, pretty much anything that actually would work for you is not allowed in Casinos, etc, and they will be quick to kick you out.
When you're not having any fun with your bet and your sole purpose is to earn profit, pretty sure you want to recover your money to bet more and it will make you addicted to gambling.
The system you talking about is abusing the casino since you're trying to find the bugs or loophole, that's why they're kick you out. I'd say that's not a professional gambler, but more like a hacker or a bad guy who want to earn money by doing illegal stuffs.
Physical casinos at least do not distinguish from the gamblers that are just using their ability in the games to make money from those that are actually cheating, for them as long as you are making them lose money then you are considered a cheater, and in fact they keep a special book which they share with each other with a picture of each person they have caught, or at least that is the way it works within the US, so even if a person is just using card counting and earning some money that way, even if he is not really cheating as he is only using his mind to give himself an advantage over the casino he will be considered a cheater and end up in that book, something that has bothered card counters for decades as they do not think of themselves as cheaters.