When they start loosing weight , they will soon realise they aren't carpet cleaners, they are slim fast junkies.
I think the reason so many are starting is because they think it's easy and they have all right to because of how the opportunity is normally sold. Make 35K p/t 75K f/t seen it in the papers all the time, Never have i seen the reality in an advert. Things like - some flats have no lifts, some dogs and cats aren't toilet trained, Amy and her chums do have their carpets cleaned(so watch out for needles), the machine has to be emptied several times, you might end up on hand and knees, furniture can be very heavy etc etc, - not all custies like to pay.
When they realise how tiring a day can be and how much effort and knowledge it takes to do a good enough job they quit. Leaving things right where they are. I am getting a machine from a guy who repairs and service them, he said come and have a look because the owners haven't been back since leaving them for repairs (over 6mths) - going up on Monday.