The WGC issued another report on gold here:
http://www.gold.org/download/file/3543/investment_commentary_looking_into_q4_2014.pdf
In there you can see the correlation between income and gold net worth per capita. The more you earn, the more gold you buy, and the funny thing is that it’s exponential. So rich people put more money in gold than poor people. You would expect that the curve were linear. Probably poor people have more basic needs…