The way I view it is this. If I went to go and clean a domestic carpet, and the carpet cost £1500, my cleaning time cost them £60, how much money have they saved for not having to replace the carpet, even it only took 30 mins to clean!
Same with commercial. Say it cost 8k for the carpets and it cost them £500 for me to clean it which say took 3-4 hours, once again, how much have they saved for not replacing the carpet. If my customer is happy, then so am I.
(Above are guides)
Darran