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?
Edit: "brainless" as in playing gambling games that does not require using brain, I thought it was clear especially given examples.
It is more decent to say these games (slots, roulette, dice etc.) are luck-based than saying brainless games.
Anyway, I don't it makes a gambler foolish if his chosen game is luck-based. We have our own way of thinking and preference. Hence, if you find satisfaction to this kind of game, why not? That's your choice and your money anyway. Just don't set a high expectation to win since it's luck-based, no skills required, therefore not easy to win.