Why are all the good ones taken?

After a marathon of blog name checking, I have finally arrived. I am now a fully inducted member of the blogosphere. My first issue is along these lines... why are all the good blog names taken by people who have only ever posted one comment, if that? Talk about commitment problems. People, please give up your blogs if you are no longer using them! Eventually we will run out of names all together, and in the meantime your blog could be used by someone who actually wishes to make a contribution to society and the internet at large. I'm sure many other bloggers have experienced this problem when trying to start their own blogs. With the environment and sustainability in the forefront of everyone's mind these days, should we not apply these concepts to technology as well? I can't help but wonder... should there be a time limit on how long you can hold onto a blog name before it is recycled?