this is the largest I've seen so far.. Your blog, boingboing.net, is worth $11,364,190.20 and no, it's not mine.. huhuhu..
Start a blog today, go to forums ask for links and there you go, have a blog that's worth $$$$. I wonder how many links are to blogs and how many are to actual posts. Links to blogs anyone can get in a few minutes but to posts that's a different story. My blog amar-ela.blogspot.com has about 300 unique visits every single day and is currently worth $0.
I don't know but.... for larger sites out there the numbers start to look closer to realistic than for the smaller sites... boingboing for ~$10 million might not be that bad of a buy (if it was offered at that...) wordpress.org (all initial WP blog installs are linked back to the site, so I think it's fair game) at ~$100 million might not be that bad either... I know they sell text links off the home page for ~200k/month obviouslly for the smaller sites it's totally off base, but I don't know if it doesn't give a good guesstimate for some of the bigger ones.