It's simple: When there's money to be made, the folks with the money to make, will pull out the stops to game the reviews. We have seen this in just about every review system ever (except Consumer Reports). They game it, milk some money, until everyone figures out it sucks, then abandon it. The reviewers count on getting brought.

I really miss Mr. Cranky[0, 1]. Here's his review of Battlefield Earth[2]:

[0] https://en.wikipedia.org/wiki/Mr._Cranky

[1] http://web.archive.org/web/20120503072554/http://www.mrcrank...

[2] http://web.archive.org/web/20120926010236/http://www.mrcrank...