Pianorak
Don't take it personally, it's purely business terminology
A "quality customer" is simply one who buys the product/service, pays on time, does not complain, and perhaps becomes a loyal customer in the long term.
It is nothing to do with someone's character. You can have a very good customer who is a real s**t personally.
The reality is that nowadays lots of people have lots of money. I don't think this fact has sunk in yet in the UK because anyone with money and some brains keeps their head low, and those with money and no brains might exhibit some unattractive traits
The average male salary, c. £20k, would probably make you jump. Most people hanging around GA earn well below the UK average salary.