To be clear, I'm not trying to say this is a good way to run a startup or that anyone should do it.
In particular, I am really bad at doing more than one thing. It is one of my personal weaknesses. Some people, like my previous cofounder Andrew, are great at it. But as a result, I HAVE to be focused to get anything done. This isn't true of everyone, its just something that I finally realized about myself and its changed the way I work. My typical day literally starts with me adding to my to do list, ordering it, then knocking them out in order.
I think the idea of a startup founder with nothing to show for himself but a string of dead websites (me) advising other people on optimal strategic decisions for their startups is a bit silly. I think all those ideas I cut out are great ideas, my brain just isn't big enough to hold more than one.