Why have only one job?

Jeff Jarvis is diversified:

I've realized that I no longer have only one job. And you know what? I like it...

I've found that this mix of things to do keeps me sane, keeps me grounded and means that I never "hate my job". After all, I've got 3-5 of them, so if one of them stinks I can always switch it out for something equally profitable that I enjoy more. It's easier to replace a job when it's only 20% of your income than it is when it's 100%.