According to Jay Zagorsky (Ohio
State
University), there is no link between IQ and wealth.  Intelligent people do tend to earn more
– but there's lots of other factors that contribute to whether or not you can turn your income into material wealth.  I'm not sure what the important ones are; presumably spending on holidays, entertainment, eating out, drinking all contribute to sending your pennies into thin air.  Giving it away?  Investing it unwisely?