Why 2 Rite Aids back to back?

Lots of people have complained about the deluge in chain drug stores around town. But Sunnyside has the dubious honor of having 2 Rite Aid stores next store to one another. The monstrosity happened as a result of Rite Aid's having gobbled up Eckerd's.

Sunnyside now has at least four Rite Aids. How do these places stay in business?