|Don't do it!|
Konrath's most recent blog post deals with the fallout from the news a few weeks ago about the Amazon authors who were using fake reviews by paying for good reviews of their ebooks, writing good reviews for their own ebooks and writing bad reviews for their "competitors" ebooks.
As a result of the situation with these few authors, Amazon has instituted new review policies. Because of these new policies a multitude of reviews have been removed from ebooks not even involved in the original situation. This has resulted in some ebooks even getting their rankings lowered because their "stars" have been lowered.
You can read Konrath's take on the situation at A Newbie's Guide to Publishing: Amazon Removes Reviews .
Panzer says, "Don't post fake reviews!"