I don’t think there’s any reasonable way, or any need, to separate vanity and ego from a personal blog. Writing is inherently about its author, and is a product of their personality and opinions – that’s not something to be shy about, and we shouldn’t try to change it either. So, write for yourself – and hold yourself to an appropriate standard, because you’d better believe that others are judging the person as well as the piece – but as soon as you publish your views, you’re inviting readers to take a look. I think that the needs of the reader and the author are more aligned than many blogging systems seem to believe.
It took a while to arrive at these conclusions, but more and more blogs start be readable without a need to run them through Instapaper or a similar service.