Unfortunately the biggest celebrities known to have had thier carpets cleaned were the very wierd John Travolta /Kelly preston , Just google Kelly preston /Kawasaki syndrome.
Branding as a joint force is what is needed , then each stakeholder puts in relatively little, but then as most of us on here do not wish to be part of a franchise , it will never happen, there is too much fear of loss.
To answer the original question , I think it is because there is no real cumpulsion to have carpets cleaned, if it were required by health and safety or as part of contractual terms via a landlord ,then there would be a far bigger market, again that is unlikely.