Ice Cream Truck Traffic

How many Ice Cream Trucks does a development need? I've counted three meandering through our neighborhood already and it's only April. They all have a different jingle. I get one jingle unstuck in my head and another one comes around the corner. I heard two jingles going at the same time, looked out the window and saw an Ice Cream Truck parade. Does this mean my development looks like we have money? Does the number of Ice Cream Trucks strolling through ones neighborhood determine ones affluence? We must be rich!