10/5/16- I just got the following email from Amazon. They are really serious about their policy changes.
Hello, Based on a policy change to our Community Guidelines, some of your reviews will be removed. We recently updated this policy to prohibit incentivized reviews, which includes those posted in exchange for free or discounted products. Incentivized reviews posted prior to this policy change are being retroactively removed if they are excessive or do not comply with the previous policy. Your reviewing privileges will not be affected by this action, but you will not be able to resubmit the reviews that were removed. To learn about our review policies, please see our Customer Review Creation Guidelines (http://www.amazon.com/review-guidelines).