Yep, that was happening to me too. I think depending on genre that there are some really high bids out there that are taking up a lot of space. I was getting "no data" until I pumped up my bid to just below what I'd make on a book, and even after that I haven't been getting much traction at all. My guess is that there are people in my genre that are bidding much higher than I can make work, whether they're doing it at a loss or if their books are priced higher than mine.
My plan is to come back after the new year and put my head to it again. I did get ahold of amazon when I was getting no data available, and they said that I was being outbid. So, it could be that you've got a glitch, but I'm getting the idea that it's just super competitive right now and maybe people have bid up against each other. You can contact them though. I think the link was through searching "contact" on the support center page.
Someone bidding $5/click on Science Fiction is going to spam all the sub-categories too, even if their book is irrelevant to most.
Some people really do have huge amounts of $$ to throw at ads to make their book(s) a success. I have no other explanation for why the same cover might show up in every single carousel on every product I look at.
If someone decides to spend $100k to make themselves a bestseller, it's probably best not to fight them.
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