A Viable Career as a Freelance Logo Designer?

I often wondered why more people don't find their niche as freelance designers. I made a nice living a few years back as a freelance designer for hair salons (truly ironic as a bald guy!). It made it so much easier because it's a much smaller space, and the word of mouth in that industry makes marketing effortless. The problem with freelance is that it is hard to scale yourself.