I think you misunderstood my comment. The point is not the amount of work involved - there are many "lifestyle" businesses that are hardly any work at all. I run an online currency exchange website that takes about 3 hours of my time / day, and
does provide a "nice living." I'm not trying to brag - trust me, it's still not fun.
The reason (for me, at least) that lifestyle businesses suck is because they're not focused on growth. They're more about an immediate, positive, cash flow - the low risk alternative.
Contrast that to startups, where you're building something that could potentially be very big, and positively impact a lot of lives. Now that's a pretty good "lifestyle."