I have actually asked this very question, and the Onion tackles the issue on my behalf.
How does Radio Shack stay in business? I occasionally stop at the one in my neighborhood, mostly because it is close to my house and sometimes you need an extension cord or a coax cable really fast. There is never anyone there. The salespeople manage to either ignore you, be rude to you or are just plain ignorant. And there are never less than two of them, regardless of the fact that there are rarely customers around.
Money laundering? Vanity business? CIA front? Just askin'.