I’ve been to this casino a couple of times. I can’t say that I received some special pleasure. Still, playing for chips has little to do with playing for real money.
On the other hand, you can buy money for real money in the game, but you can’t get it back. I think it's better to spend money in a real casino if there is a desire, than to throw them in vain.
It's true that money in the game isn't much worth in the real life but on the game that money really matters and players want it. I know some people who actually bought the criminal packs before and spending money to improve the quality of entertainment they get from the game. That game is for entertainment purposes only and you can learn some new things there like in my case I learned to play blackjack in the diamond casino when GTA V is available for free.