Profit is naturally part of running a successful business of any type, as is providing excellent results for the customer so that you have ongoing business.
Here is a link to one of the Truckmount suppliers. http://www.prochemaustralia.com/pages/truckmounts.php#1
The machines pictured are just the power plants. There are hose reels and an assortment of tools that go with it.
These machines weigh around 1 tonne and are generally bolted into the back of a truck or van and are powered by petrol or deisel engines.
The efficiency comes from the fact that the electric machines that you hire, are limited in power to a maximum of 2 horsepower. This is because you have to plug it into a power point in your home and that is about all the energy you can drag before you start blowing circut breakers.
The machines pictured range anywhere from 20 to 65 horsepower. This means there is greater water pressure which means greater kinetic energy for agitation. The machines make their own hot water by taking wasted heat from the engine to provide contiuous hot water at the carpet that is even hotter than the water in your hot water system at home that looses heat when you put it in a tank of a hire machine.
The heat provides extra thermal energy that also contributes to the cleaning action.
Then there is the professional chemistry that is not availabel with the hire machines. It is the chemistry and knowledge and experience in the use of that chemistry that also contributes to the final result. Plus a knowledge of how the chemistry interacts between the various soils, stains and indeed fibres to ensure that no harm is being done that may affect the re-soiling characteristics of the carpet or indeed the longevity of the carpet.
Many people can produce a fairly acceptable result when they clean their own carpet and that is good.
That is until something goes wrong.