@Sarah977 @Ann72 @Mark116 et al.
I have hosted plenty of guests who go through half a roll of toilet paper each a day. It doesn't seem to be uncommon at all, although I also wouldn't say it's the norm.
I suspect they are using it for other purposes though, like blowing their nose or whatever, and some rolls from the bathrooms to keep in their rooms. When I was cleaning a room the other day after a guest departure and emptying the waste paper bin in her room, I realised the entire thing was full of just tissue. Weird, as she didn't have a cold while she was here.
Because I am a live in host, it's easy for me to top up toilet paper as needed. I wondered if leaving more rolls in the bathroom encouraged guests to use more of it, e.g. gave them the impression that no matter how much they used there was no risk of it running out. So, I started leaving one roll + one spare in the bathroom and just replacing when necessary. I can't say that it's made much of a difference. People just seem to use a lot of toilet paper.