First of all, you don't write _great_ blog comments. If you have something really great to say, you publish it as a blog post, submit it to social news sites, and put a link to your post in a comment to the original post. People do that and they are successful. Comments are for losers.
Yeah, that's a lot of trouble to get your stuff (possibly) noticed. I'm sick of this expectation. Technology should address this as a problem. Am I really expected to do a blog to be part of "the conversation"? Am I only listened to when I do the social media dance? I don't like this world.
Something needs to replace the blogger/commenter dynamic. Something that puts people on equal footing by default. The blog dynamic too easily devolves into a high status/low status game.
On second thought ... Arrgh!