Another very important reason to buy a franchise is intertwined into it's basic nature. Franchising inherently leads to rapid growth, because the franchisees provide the expansion capital. There are few restraints to growth in franchising. As a franchise system expands into hundreds of units many positive things begin to happen. The name begins to become well known because people see it everywhere.
Most people associate size with success.
The bigger the franchise the better it must be. The large number of units enables the franchise to advertise heavily, which tends to increase sales. A synergy begins to be created in which success begets success. The franchise can buy products in large quantity at significant discounts which it passes on to the franchisees. The synergy just grows and grows.