In the 1990's I remember B&N had almost no shelf soace for D&D (if any), but lots of Vampire, and other WoD stuff.
One time they had some Castle Falkenstein books (a gonzo gaslamp fantasy/steampunk setting game. I think you'd love it Anonymouswizard).
Anyway, just because D&D, and Pathfinder are the big dogs now, they weren't always, and may not be again (I certainly remember a time when three other games were more popular).
Well... I did pay the 25 cent fee to take the shinkwrap off and read the rules.