I agree. I think PG addresses that issue when he says it's difficult for the market's and the founder's needs to coincide. That is, to find something that (A) you love to do, that (B) a market also loves. It's hard enough to find something you love; or to find something the market loves - to find both is not just twice, but squared as hard. It's easier to find those two things independently: find something the market loves, get rich; and then find something you love.
But if you can find both (and people have), it's GREAT.