Many many years ago, I tried to do solo musician as a career - I write, practice, and perform the music - and in addition to the crushing poverty, the solitude was really hard. When I ended up working for a software company, I remember telling people, "Gosh I wish there was a Lotus Development for guitarist-composers." (I'm dating myself...) In addition to the lack of social contact, there's the lack of externally provided structure - schedule, resources, breaks, milestones. I just think it's hard to be a one-person anything.