Bring the Pokerrpg stock market back with a slight revamp to casino related companies:
Slot Makers - Bally, Konami
Card Makers - Bicycle, Hoyle
Chip Makers - Excalibur, Paulson
Also add investments in gold and crypto currency:
Gold can be kept in the vault with defined space limits per upgrade level
The crypto can operate beside gold with the idea of expanding crews and use as a trade or payment for casinos

The idea was put out to have buy and sell orders of when CP are sold to optimize the market, the same strategy can be applied to the gold and crypto.

-tryharderfish