both of my 2 star casinos are capped out, or bugged
There is a lot more capacity, but both of them are showing messed up income versus expenses versus profit. Both have the exact same stats (show in the screenshot), capped at 3999. they were both at 3999 before i added 12 spotlights to them, and nothing changed accept that each have 20 more customers, same stats otherwise.

The discrepancy between revenue, expenses, and profit is due to your crew’s profit upgrade. We’ll update this menu to reflect that.
By making adjustments to your casino in a test environment we were able to bring profit above 3999. Try making a few more tweaks to get it above that amount.
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Scott Norris commented
then i must not understand the popularity and income stats at all. Adding 12 spotlights is 60 more pop, it brought in 20 more people and yet, no change in income. I assume, maybe wrong, that each customer is considered 'playing' and therefor generates income. I shouldn't remain totally even on profit with 20 more people in the casino.