A lot of it comes down to the employees. Eight years ago, I was helping a friend rig his trailer with an electric tailgate. Went to an old-school NAPA store and asked for a single pole, double throw, normal open switch. A couple of the old hands looked at me like I was from outer space. A high school aged girl was also working behind the counter and overheard my request. She told me, she had run across a switch like that, while thumbing through a catalog. She didn't have one in stock, but could order one. That's the person I would hire if I was looking for a stock-clerk.