And furthermore...
I notice a lot of responses saying "I would never have the discipline to sit and write 40 hours." First of all, there's nothing like that monthly mortgage, cable/internet and phone bill, not to mention those $50 fillups for the car, to motivate me to go home every night and do something constructive. And every day off too. Thank the stars I have no family. So I would love to be able to focus on just one project for 8 hours, and then go out and be a person at night.
To be fair, sometimes you go dry. Sometimes you need to rent movies, or walk in the park, or sit in Starbucks and think about your life. You need human activities and contact, if only for inspiring material. You need to wait for inspiration to happen. Pros do too, I'm certain; they just can't wait as long.
To be even more fair, I not only write but play music and animate. I realized if I was ever going to break out of the cubicle plantation I would need to be organized and disciplined. So I track hours, I budget like a mofo, and I wait a little longer for those rare days (and nights) when I just get to have fun.
I think it would be a better life, don't you?