I also host Airbnb in my house regularly (near constant during the summer season) and this is a head-scratcher for me too. Most guests aren't TP hogs, but some are, and some steal it (yeah, I don't understand it either). Not a big enough deal to really care about, but I notice because I restock and field questions like "We are out of TP, do you have any more?" (I stocked 4 rolls for 4 days, and you're out of TP by the 3rd day....yeah, someone's using it excessively). I also generally provide paper towels and nose-blowing tissues, so I don't expect people to be using TP as their only paper cleaning product.
I'm generally a tidy person, and usually use 6 squares (two iterations of a folded set of 3 squares) of the "Marathon" brand from Costco per #2 (inexpensive TP, but not one-ply, state park level cheap). If I were using really nice TP like Charmin, I'd use 2 squares x 2. Even if I assume that someone with a harder to wipe butt than mine uses double or QUADRUPLE what I do, it would still not come anywhere close to a roll per day, even for multiple people. Possibly other folks didn't have parents who taught them how to wipe cleanly/efficiently/effectively? I've also been told that there exist people who believe that touching butts is gay (or will turn them gay? I didn't ask the details) and therefore use literal piles of TP to keep themselves from making accidental contact (This seems dubious to me, but I've been wrong about people before).
FWIW-- Myself, SO + 2 kids will generally use about 1 "Marathon" roll per week, including usage for nose-blowing, as I don't buy kleenex of any kind.