When the pizzeria makes 100 pizzas per day, it earns an economic incentive of 10% of sales from corporate. This is be cause corporate knows general advertising can only do so much. Local franchises need to take up some of the slack, post their own signs, and do some the legwork to get people in the door. If they can get at least 100 pizzas sold per day it's an obvious sign to corporate thay they must be putting in the extra effort. Extra effort means more money for corporate so they provide extra incentive to motivate the masses :)