Hmm, good points and it may seem that way, however, I don't think it's really obvious where the demarcation line is drawn at all... Does it include people who have started from scratch, grafted all their lives and now get a £100k+ salary, or is it only for those born with a silver spoon in their mouths who'll never have any money worries?
Both are exceedingly well off compared to many less fortunate folks out there!
Edited to add: Not trying to get a 'rise', more of an appreciation for how others think...