>Are people that bad at peeing that there's a need for urine remover in extra as well as regular strength?!

Products like that aren't for when someone pees on the toilet. It's for when someone's toddler pisses in the corner or an incontinent elderly person has an accident. The supplier probably only stocks the extra strength one because for "regular" urine removal normal janitorial products are used. The special stuff only comes out when piss is somewhere it really shouldn't be and needs to be as gone as possible as fast as possible. Given the choice between the $10 bottle and the $20 bottle that supposedly works better most commercial customers are gonna opt for the latter for that use case so that's what the supplier stocks.

Pillars of Hercules (god rest its soul) in London had an infamous and constant layer of liquid on the floor of the men's toilets. Many times I had to suggest an alternate destination because I was wearing my Vibrams.

Have you seen men?

Tellingly, my wife informed me that there wasn't a bottle in the women's restroom.