That what I'm saying ... it would have been ALOT of area rugs I'm sure. I Haven't replaced one piece of furniture or area-rug or wall to wall carpet in 27 years. I still will charge more to clean that 100% wool rug vs synthetic . Same thing goes for upholstery , the more delicate it is the more $ I'm charging never mind risk of damage, I'm charging for my knowledge so it doesn't get destroyed.
I'm concerned you're looking for an argument where there isn't any. If there were a lot of rugs to be cleaned for that $900 then that's fine... but if there weren't then it's not. That's all I've said the whole time.