For me, I think that it's because I don't like the complications that reality imposes upon me if I actually start doing something. That's why I wanted so badly to be a theoretician...but again, I found the process of going to school to become one too onerous to continue. I suppose that this could just be laziness, as it certainly takes less effort to dream about something than it does to actually do it, but I like to think that it's a little deeper than that, too.