Yes, the bottom line is that wealthy people are only interested or serious about an activity when it can actually benefit them. Their perspective is very realistic, especially when it involves money, and gambling is clearly not an option for them.
I agree with you that gambling for wealthy people is no different than watching a movie, just a way to pass the time. However, this shouldn't be limited to the wealthy; all gamblers should treat gambling this way, as it is the correct approach.
It sounds that wealthy people dont care about money. Maybe they do care less than others, but I believe they are also disappointed when they lose and wish they have their money back. It might be, that rich people are more easy to get addicted, because they have opportunity to gamble more frequently than others. However, it does not matter who plays, rich or poor. As soon as fact of easy money starts to steal gambler focus, addiction starts to form.