That isn't it. Employers know that if you have passion, you'll be willing to work more for less money. Which is why they so often insist on passion. Also, I've

That isn't it. Employers know that if you have passion, you'll be willing to work more for less money. Which is why they so often insist on passion. Also, I've seen plenty of people on HN insist that people doing "creative" work (excepting programmers, who are obviously worth every penny) should do so for free so as not to taint the purity of their work with capitalist incentives. It isn't an assumption that what's fun can't be highly paid, rather it's an assumption that what's fun shouldn't be highly paid.