Retail medical facilities are designed to respond to demand for more accessible nonemergency medical care. Thus, they follow the same principles as any market: hours that suit customers and prices that can be paid by available methods (out of pocket or insurance). Most clinics are owned by drugstore retailers or hospitals.1
A long history of health services research demonstrates that, when people lack it, access to health services is their highest priority. Thus, it is no surprise that providing easily accessible services meets an important demand in many populations that now lack it.
Barbara Starfield. The Geographic Accessibility of Retail Clinics for Underserved Populations—Invited Commentary. Arch Intern Med. 2009;169(10):950–951. doi:10.1001/archinternmed.2009.110