Yes, I agree, most people that play these either have too much money, too much time or have an addiction problem... I understand going to a casino because there is a sort of social aspect in it when one goes with friends, but in these games there is no social aspect, there is just pure gambling.
I can see some succeeding in the long run because some like to gamble every once in a while to satisfy their addiction, but if we get an influx of casino-like games in STEEM most will fail. There aren't enough gamblers for the amount of casino-like daps the crypto space has and is having.
But this is just my opinion of course, after seeing people on Bitmex gambling their money away without knowing anything at all about trading I'm more and more inclined to think this world is full of addicts.