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16 of the PR8 links are from the same site, however they do not sell "blocks" of links / advertising so its of very high quality.
I have no idea whether the PR7 is high or not, as I am using the Google directory as a point of reference.
I wouldn't expect a jump from PR6 to PR7 upon purchase of a single PR8 link... especially if they place a lot of text link advertising on the page.
Not forgetting that it's been so long since the last update, the page may no longer even be a PR8 anymore.
I wouldn't expect a jump from PR6 to PR7 upon purchase of a single PR8 link
Also, is there a trickle-down effect on linking from a higher PR page to a lower one throughout the rest of the site?
It is possible one link from a PR8 could make your page a PR8, and it is possible one link from a PR* micht only make your page as little as PR5 or 4, if it is a low PR8 with hundreds of links on the page.
There is no generic rule. The PR a page with PRX passes depends on the amount of links on the page and how high or low a PRX it is.
<It's possible the page might not pass PR at all, and even likely if you are "buying PR", but that is a different issue.>