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Nobody considers the casino business as an investment.
The casino business was built using quite a lot of cash capital and the owner must continue to prepare money at any time if needed and profits from this business can be obtained at any time without having to wait for a long period of time if the casino has achieved success and managed to become a big casino while investing someone spends money to get profits and profits can be obtained when what is invested has high value and requires patience because investments tend to be long term.
Even though both are equally profitable, they have a big risk of experiencing a loss or losing the amount of money spent.
But it is true what you said that the gambling business can generate more profits than an investment.