I think the percentage of rich people in the world should even be lesser than 20%. If it were like 20% then the margin is not so distant like expected and these days with the crunch of hardship, the margin is getting wider. The economic downturn is not really affecting the rich because jobs are taking away from the poor while the rich is reinvesting the suppose salary of the poor whose job has been relieved off into other businesses because the rich is smart to take steps for the future that is filled with inflation also. This is the difference, the rich think of the future while the poor thinks of the immediate.
The upper class already have a lot business, they're also make a lot money from stupid poor and middle class, so it make them can expand their business become bigger and bigger.
It is true that the poor has a flamboyant life style to gain approval in the society but the rich really don't see a reason for that approval because they already seen above that. They know acceptance is not in appearance but what you were able to achieve.