The problem with the simplistic "do what you love, love what you do" advice is that it is not reliable or repeatable. I can point to tons of people who love what they do and are still somewhere between solidly middle class and struggling to get by.
Of course it's not repeatable. There's no repeatable way to get rich quick.
I think of it this way: Suppose you don't have exceptional abilities. If you do what is prestigious, what "seems" like it will get you rich, what other people tell you to do -- then you have roughly a 0% chance of getting rich.
If you take a slightly unusual path, enjoy it, and get the flywheel/positive feedback loop going, you have maybe a 1-3% chance of getting rich.
So if you want to increase your chances of getting rich, I would do something that others aren't, and do it to the point past where others would give up, because it's not making them any money.
The thread is over if you want a repeatable way to get rich. There is something analogous to the "no arbitrage" principle for personal income. If there were an easy way to get rich, someone smarter/earlier/luckier than you has already taken it, and they didn't tell you about it until afterward. You have to find your own way.
You're right that the "do what you love" advice is crap. However, I think -- and as Chubot points out -- you have to also avoid the same behaviors as others and offer something "rare and valuable" if you desire money. For those people that you can point to, do they offer the latter and do they have a good sense of when to cash in?
This post from Cal Newport elaborates further[1]. I highly recommend his book So Good They Can't Ignore You.
