i'm with joe on this one, the only way to clean a carpet is "the right way" few customers have a vacuum like the sebo so the process should allways be the same including pre-vac and all the other steps needed to do a proper job, the only variation in price should come from not having to move furniture or protection which is the customers choice but the job of cleaning can and should only be done the one way.
Who decides the right way to clean a carpet?
I beleive if you only clean with a rotory you cannot clean all carpets the right way. I also believe, but outnumbered here that you don't do as good a job with a portable, no matter how many vacs you got, than someone who knows what they are doing with even a smallish TM.
Getting into the realms of what's right and what's wrong is very different to identifying blatant scam merchants.