I am hoping to get some hard data or experienced insights on a question that seems to get completely ignored in most KDP discussions: generally speaking, what is the safe review-to-sale rate? Everyone says "Just get some sales while requesting reviews to make it natural" but what is "some sales"? it could be 5 sales per 1 review, or 10 sales, or 50, which one is safe and which isn't? I have had my books blocked before for review manipulation for using bookbounty, to my knowledge, the only suspicious thing i was doing is driving high review to sale ratio in the book launch, requesting over 10 verified reviews while not making too many organic unit sales, which resulted in a suspension that i had to deal with, luckily i got my account back. Websites like these often ignore the risks of requesting multiple reviews while not driving enough organic sales, because a 20% to 40% review-to-sale ratio is an immediate red flag that will trigger an automated manipulation block. even something as low as 10% could be deemed risky and very dangerous if the book doesn't have a high BSR (for example, if a book has 40 total sales and you use BookBounty or BookVillage to secure 10–15 verified reviews in the first two weeks, you are sitting at a dangerous 20%+ ratio right out of the gate, even if those reviews are very genuine, not AI made and from proper accounts, it still flags as highly unusual) So, where is the line? How many pure, ad-driven or organic sales do we actually need to generate before we can safely request reviews on these platforms without getting flagged by a velocity bot? Has anyone cracked the mathematical threshold?