Retail Clinics: Location, Location, Location
A study published in the Archives of Internal Medicine found that retail health clinics gravitate toward more affluent neighborhoods. They could, therefore, not be serving the under- and uninsured or poorer populations that are in more need of healthcare. All this comes down to is profitability for the companies operating the clinics.
Hopefully as the model expands and these companies become more stable, they'll move into areas that will serve more needy populations.