Sure, maybe there's Evian or whatever, but at least for me, it's well outside of my normal experience. Most of the expensive water we buy is pure convenience, because we'll buy from the guy with $2 water instead of $3 without thinking, given the chance and all the common brands are blurred together (Evian is really the only one that sticks out).
So... yeah. I'll agree that it's a proper example, it's just not something where quality is a major consideration, at least in these parts. YMMV.
Discount Tire also uses the good-better-best philosophy, with the middle choice being most popular.
I'm used to all water being exactly the same price in a given location and to only noticing when they jack up the price for captive audiences.