What do we mean by the term "gambling experts"?

As much as I want to understand fully the term, I see these experts are the typical regular gamblers with lots of knowledge and familiarity about gambling in general, making it their advantage, but not to the extent that they will rely on it as a source of income.

Also, from what I see, gambling experts don't care about fixed income like 10%, 20% or so. These gamblers don't care about fixed income per month as what they want is to just win no matter what in every gambling session.

But for the sake of answering the topic, hell no. I'd rather look for a non-risky job if the purpose is just to maintain a 10% earning of my supposed gambling bankroll per month. The risks is not worth it.