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>My overall concern is that many paid promotion places are not delivering perhaps as well as they used to.
For me the KDP sales curve bent upward until January 2012 and has been downward ever since except for a revival in April, May, and June of this year as Amazon slow-walked physical books and pointed people to digital. That would be four golden years, which was also about the life of Google AdWords, Amazon Associates, and Facebook for me (four years of rising income, followed by a decline). Amazon Marketplace held up longer, but now that's pretty much played out. I suspect the same will be true of AMS ads.
For me the KDP sales curve bent upward until January 2012 and has been downward ever since except for a revival in April, May, and June of this year as Amazon slow-walked physical books and pointed people to digital. That would be four golden years, which was also about the life of Google AdWords, Amazon Associates, and Facebook for me (four years of rising income, followed by a decline). Amazon Marketplace held up longer, but now that's pretty much played out. I suspect the same will be true of AMS ads.