Yes, gambling require the self-discipline to avoid addiction, when faced with tempting bonuses one needs to be careful and set aside a limit to what to do and how long to stay in the game even though there are lots of cash backs or bonuses. Most time, gamblers fine it hard to look away from good bonuses, and this has made it hard to avoid them.
I don't understand what's the point you're trying to say, when someone can control his emotional and discipline, he can gamble freely without need to avoid it. However coinplay is lack of self-exclusion feature, this is really need in order to prevent addicts to access the casino. So it's really depends on the gamblers, but addicts are the really important for the casino since it's where they will make a lot money lol.