[mindways]

From what I've seen, the truth is more like, "Following a passion of yours for a living is likely to take some amount of fun out of it, but the hit's usually pretty small; just realize that doing something as a profession tends to have some fundamental differences from doing it purely for fun / fulfillment."

Or perhaps the size of the hit varies - for some people / passions it's small or zero, for others it's big, with the peak of the curve being "some but not too much"?