Additional to your opinion, Even if a person gamble for a long time, I won't advice to leave the place right away because he needs to have an adjustment especially that he used to gamble in that place. A good gamblers understand which games to play and which to avoid. A good gambler wouldn't look to get rich quick overnight letting greed go to their head, unless its with chunk change, but instead would diversify their risks over time, so that if they lose they don't lose big.
You're correct, a good gambler would have a strategy to use in gambling regardless of gambling not been an activity that you can depend on previous results but a good gambler won't just be gambling out of luck. As a good gambler you should know when to leave the casino or continue playing, there's not a time that is the best time but as a good gambler you should be able to know when the games aren't favouring you to quit so you don't lose more.
Gambling is a type of an activity that can make your profits or make you to lose money, it depends on how you handle gambling that the results will come out for you. Those individual just gambling for money don't make money but those individuals gambling for entertainment get some profits as bonus to their entertainment. Gambling is neither good or bad, don't gamble of you have addiction problems.