In other words, if you are a game developper, you need to figure out why your product will be a high growth product. You should not treat it as an art exercise (if you wanna succeed economically).
For example, the art style of world of warcraft is not like it is because that was the art style of the art director (well it is but) they did it like this because they knew this was the kind of art that is needed for a high growth product. Everything in world of warcraft (its just an example) has been done to reach high growth, they werent doing an art exercise that happen to be successful. Its a mindset most game developers wont ever get.
Of course you can do art exercises and be lucky. Just be conscious youre playing at the lotery though.