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However, even if this was not the case, i'm pretty sure that link popularity as the basis of Google's operation would have been reverse engineered in principle very quickly.
edit: or did you just mean releasing the actual PR value of pages.... :D
Consider Pagerank a mistake on Googles part that they have never addressed due to possible public relations issues.
My car is fairly reliable and only broke down twice in 8 years so your telling me my car doesn’t work? Then what car does work 100% of the time?
Page rank is fairly reliable and there is only a minority abusing it and buying it. Btw Google is also the number one SE.
If you buy Page Rank your site will have more page rank but will you rank better than other sites with the same page rank or slightly less, the answer is no.