According to this article:
Wealth of nations: Top 10 countries by average wealth per adult
In term of average wealth per adult in 2011, Switzerland, Australia
and Norway are the three richest nations in the world, with
Switzerland recording the highest average wealth per adult at USD
540,010 - the only country to exceed USD 500,000. In Asia Pacific,
Singapore follows Australia as the second wealthiest nation in the
region and fifth in the world in terms of average wealth.
and this one:
In the Middle East and North Africa, or Mena region, Qatar recorded
the highest average wealth per adult of $146,623 in 2011, a rise of
456 per cent from 2000 while Kuwait followed closely with $134,592,
rising 156 per cent from 2000. The UAE was placed third in the region
with $115,774, up 104 per cent since 2000.
while UAE citizens (assuming adult ones) are quite rich, they are not extraordinarily so.
If this answer:
Bentley prices range from $200,000 to around $400,000. the average Bentley is closer to $200,000 brand new. The Bentley Continentals (the most popular ones) are 200k - 300k. The Mulsanne, Azure and Brooklands are $300k-400k.
is to be believed, it is not conceivable that every adult has a Bentley, unless they are massively into hire purchase!