The appraised value depends on how that Page Rank was attained. If the network that built the PR8 doesn't transfer with the site (where the network is owned by the seller), the perceived value to the buyer will be much lower than if the network is intrinsically tied to the website. I cruise Flippa from time to time and I'm amazed at what some of these sites sell for. For example, a site that historically pulled in $200 to $250 in revenue monthly x 2 years sold for $8000. Don't ask for the URL because I don't remember it - I was just cruising.