Ive been experimenting with amazon ads for quite a while now. Currently I'm comparing click through rates for different ad blurbs. I'm using the same key words, same ads and, comparing across the same book. What I see is that you get the same data for a keyword across each book. This is misleading. It makes an ad look more effective than it actually is.
Well I kept watching and eventually sent a query to Amazon and here's what I got back:
We recently discovered a discrepancy in the estimated total sales attributed to your interest-targeted Product Display Ad campaigns with Kindle E-reader placement. This issue may have resulted in over-reported Estimated Total Sales, also impacting the Advertising Cost of Sales (ACoS) calculation. This reporting error did not affect your royalties or your billing, which is based solely on clicks.
As of today, your reports have been corrected and you should now see the adjusted numbers in your campaign dashboard. We apologize for the inconvenience and have applied a click credit of $50 to your AMS account.
Thank you for using Amazon Marketing Services.>
So YAY!!! And now I can keep on havinga great time with my ads.