We get through God knows how many toilet rolls when the granddaughters are here for the weekend!
We've always had a bidet in this bathroom & the grandkids have a great time bathing their toys in it! Also, when I'm having a wee, Milly the cat sits on it waiting for me to turn the tap on!
I don't think you need a bidet if you wash, bath, shower regularly - we also get thro' loads of botty wipes!