Its because they think they will save money by doing it themselves. They believe the advert that tells them how easy it is to clean your own carpet. I honestly believe trading standards should get involved here. It's the same with Rug Doctor. A Rug Doctor is incapable of cleaning a carpet properly. If you use shampoo to clean a carpets the properties of shampoo make it easy to over wet the carpet. The machine has a very poor vaccuum so can only suck water from the surface of the carpet leaving lots of soap behind. As the carpet dries the residue rises to the surface leaving a sticky coating and the carpet re soils rapidly. Along comes Joe Carpet cleaner to put things right only to find his machine is full of foam almost straight away.