I'm a professional writer. Over the past decade I've written about 800 magazine articles on dozens of topics. With print publishing, the article appears, you get paid, and then - if you want to keep eating - you have to soon start working on the next job. It's always a hassle to find new jobs, and magazine writers don't get paid much anyway. The thing I like about AdSense is that each article can continue earning money indefinately. I'll own all of my own work, and eventually I won't have to worry about finding new jobs all the time.
Anyway, here is my question: If you were starting up a for-profit website from scratch, and if you have the ability to write about nearly any subject, what category would be the most profitable? Cancer? NASCAR? Brittney Spears?
How would you best evaluate different categories for profit potential?