Hallo..
How much is a PR 6 worth
.us domain
No of backlinks it has? Probably $100 bucks.
Pagerank doesn't really mean much anymore. With all of the updates to google, I see websites that have PR0 that rank higher than PR6's all the time. It comes down to the content, social media, traffic and a bunch of other variables that google keeps secret. I don't even think PR means anything anymore.