Players can buy houses and turn them into businesses. Like initally being able to sell a limited number of items but if the business grows then it gets more item slots.
Same for gangs. Lets say if enough people are in a party and own enough property collective that area becomes gang terrority.
Heres my other idea i had at the era POW WOW event. Gangs have territories that can be taken or gained. Businesses in that territory have to pay a protection tax to the gang in control.
Man im smart. Dont go stealing these ideas atrius etc.