I think we all do it sometimes, well I do.
Go off on one at the time and then calm down a bit.
I used to dump customers who moaned just once then I realised it was costing me money. I ditched a customer who was in the middle of a row of three for example. :
Doh! I thought afterwards
So now I go away and come back later, if they are too bad I ditch em, but usually I just up the price.
I think sometimes when I read posts from some people that they dump too easily and are a bit too sensitive.
I'm not suggesting you should just take everything on the chin, but maybe develop a thicker skin and just laugh it off sometimes, I do a bungalow, the old lady who lives in it is 'a bit funny' so no one would clean her, but I do she nice as pie and I charge £14 for 15 minutes work..
As for wealthy customers, often they are wealthy because they are as tight as a duck's a@se, and that's watertight!