A lot can depend on the area,how affluent it is etc,there are high paying customers in every area i guess but some have a lot more than others.
Although Dave always talks about his high earnings ,you would have to spend a lot of time researching and targeting these types of customers as well as giving an unbeleivable service.
Its not going to be acheivable in the short term,in my opinion it takes five years min, to be an established competant carpet cleaner,then you can move on to targeting the high end market.
As in all trades you can only command top dollar if you have got the experience, training and can sell quite well.
I'd certainly get out of bed for £200 a day,i like to earn more ..sometimes i do ,sometimes i don't but everyday i'm working my business is growing and the more it grows the more i can pick and choose the jobs i want to do, thats my way of looking at it anyway.