Why do grocery stores have crap bathrooms?

Seriously, why do they make us walk through those dark swinging doors (you know, the ones that make you feel like you are entering a forbidden zone,) navigate the stacks of bread, find the stairs and wind our way upstairs, through the employee break room and finally to a generally nasty bathroom? And for a place that has all sorts of fancy toilet paper options why do they always seem to have the single-ply varietal?

Why? And this is not just old stores. I experienced this at a recently renovated Pavilions.

Wouldn't you think that a lot of moms with newly-potty trained kids are in that store? Do they just not want people using the loo at their market? To Seinfeld a bit, What Is The Deal?

I should mention that Whole Foods is the only market with a dedicated public bathroom. Thank you Whole Foods.