Well of course I went off posting some comments without reading the full thread first.
It occurred to me very fast that this must be too good to be true. Even if a PR7 page had 1000 links, each of them would get as much juice as a single link from a PR4-5 page because of the logarithmic scale.
So I came back to read the full thread to double check, saved a lot of time. I even checked show recent comments and all comments disappeared from the view.