It is pretty true. It is not a wise decision to make gambling be the main job because we can't expect to earn money constantly in gambling. Most gambling games are based on the luck, it is very difficult to always win in the games. Although we already played the games for many years, there will be always no guarantee to win them. Sure, experienced gambler must have better chances to win, but it doesn't mean guarantee the wins. Because of this uncertainty, it is better to gamble as a side activity. Or to make gambling just for fun activity. Don't try to rely for monthly income from gambling, it is a very high risky!
It’s not a wise decision to make gambling a source of income because gambling as an activity isn’t a job and while there is an opportunity to win some money sometimes, the wins aren’t consistent and you don’t know when you’re going to win some money. The uncertainty of when there’s going to be a win rules out any possibility of using gamble as a source where some income can be earned.
Better to play for fun and relaxation than to play in an attempt to look for a way to earn money.