Whatever McKay's business model is, they should franchise it. I've never been there when the parking lot didn't look like they were giving dollar bills away.
They draw an oddly People of Wal-Mart crowd for a used book store, which contrasts (sometimes hilariously so) with the reliably goth/hippie/alt./nerdy staff that you'd expect to find at a mega used book store in a college town.
In there the other day, wending toward the front with a basket full of Flashman novels and back issues of MHQ, I passed the audiobooks section and saw two little old ladies poring over them. One, dressed in a teal pantsuit with a matching felt dumpling of a hat on her head (a hat that had what looked for all the world like a dead bird and a bunch of flowers affixed to one side of it,) sported the spackle-like makeup and hair dye of one determined to not go gently.
She turned to her friend and blurted, and not in her inside voice, mind you, "Edna! See if they have that Fifty Shades of Grey book!"
I am not often caught at a loss for words, but there you go.