How do you determine value?

I came across a site recently, dnScoop.com, that claims to estimate the value of any website that you enter. Ok, just like all of you, I couldn’t resist. Yes, I typed in the sites of a bunch of my friends and the A-listers because of my own curiosity. Some of the numbers were staggering. The numbers were beyond ridiculous and I have no idea what kind of formula that dnScoop [...]