The major flaw with this article/study is that it defines wealth in terms of income rather than net worth. It would be interesting to see how much time high-income/low-net worth people spend their time in comparison to low-income/high net-worth, and high-income/high net worth. It may also be further intersting to see if there is a correlation between spending less time doing things you enjoy, and how much of the income is earned (as distinguished from passive income, such as royalties and dividends).