It's said about brain that, "use it or lose it" — now, question being, do you think if person plays brainless gambling games such as slots, dice for major part of his/her daily routine, will it make him/her dull?
All those games you listed are casinos games -- has nothing to do with being brainless.. That you feel it isn't fair enough to gamble on, doesn't mean others don't try their luck and still get the best out of it. If it makes them "dull"? Well, you sound like someone who has zero clue about what gambling is.
Edit: "brainless" as in playing gambling games that does not require using brain, I thought it was clear especially given examples.
Okay, I get it... I think it's just a problem of poor choice of words to express exactly what you mean, but I got you! There's nothing on planet earth that involves human actions, but without the brain... Are you just trying to take us back to Basic studies about the "Nervous" system again?