[marcus_holmes]

no, the conversion funnel is "people see ad -> people click on ad/notice book -> people buy book". Getting the advert in front of 100mm people to sell 10K copies seems reasonable.

[Nemo_bis]

Indeed, given a rather typical conversion rate of 2 % you need a lot of people at the beginning to get thousands of sales. https://www.wordstream.com/blog/ws/2014/03/17/what-is-a-good...