Exactly right - when you stop feeling gambling is fun, there is no point in playing anymore.
So many gamblers that I know view gambling as a tool to recoup past investment losses/make short term, quick profits. But they don't understand that each bet they have has a negative EV, which is why the house is willing to take on that bet with them in the first place.
Sometimes a little mathematical literacy is all you need to poke through the delusions that have been formed by the mind. This is one of the prime examples.
Some of the people didn't too much notice they are getting addicted into playing of gambling because it satisfy themselves but afterwards being to much gambler they already deposit and wasted a lot of money on that time they urge more to earn because they want to take back their money again. This is the reason why having a self control when everytime we gamble. Gambling is just right there but the money is hard to earn. We know that there's a statistical formula if you want to play gambling but if you are good with numbers and probability there's a chance you win the game but if you are just hoping for luck i don't think so with it.
Make money from gambling is obtained by a few and this must be understood. A gambler must understand why he is gambling and how much it costs him. If he enjoys gambling more than other comparable types of entertainment and it does not result in a serious reduction of his finances, I do not see any problem with it. If his loved ones suffer from this hobby, then he needs to stop gambling.