I think we're having a disagreement over our definitions of "wealthy", which makes for a pretty boring debate. After reflection I don't think you're advocating for "work for peanuts! money sucks anyway!" so much as "charging market rate, working sane hours, and being OK with the fact that you won't ever have $10M in the bank is a perfectly sane choice", which I'd absolutely agree with.
(tl;dw: After a brief burst of happiness, wealth has the approximately the same impact on happiness as losing your legs in an accident (i.e. NONE))
http://www.cnbc.com/id/100431776
tl;dr the wealthy don't believe that money buys you happiness.
http://www.livescience.com/5462-happiness-wealth.html
"Wealth, fame and good looks may be a formula for anxiety rather than happiness, a new study suggests."
There's TONS of data on this.