One suggestion ADJump, is to outsource some of your writing. I'm an excellent writer, but my income really took off after I hired extra writers to add regular content to my sites.
This allowed me to concentrate on developing and launching new sites. I've got a dozen good money makers, but I'm only writing everyday at two of them. I spend about an hour each day giving editorial advice at the other sites. It's not exactly on autopilot, but it's not hard work.