I’ve seen this go both ways, and I find it really interesting. I’m, personally, solidly in the “passion” camp. I’ve got a few friends though where “building the business” is the passion for them, and what the particular business is doesn’t matter all that much. Seeing the business grow and knowing that they’ve got staff that they’re providing a good life for... that seems to be enough for them, even if they’re not particularly passionate about the specific businesses.