When the Developer gets the insurance business up and running...........how about a buyers club. They buy in large lots (Like WalMart) and pass the savings along to all residents.
Then buy a cruise ship for the exclusive use of residents who would pay a small fee to cover beer consumption.
Then build a car manufacturing plant, a place for all the home constructions workers to have jobs after build-out. Residents could buy cars at a much discounted price.
Etc..........................