The problem with these reports is that it is reported as if distribution is a success by itself. However, the success of an advertising campaign is never measured by the number of flyers that were distributed. Rather, it is measured on the rate of response from these.
Hence, a success report should read: We have distributed 300 publications. From these, 10 have reported to have read the book. 4 reported that it had a positive influence for them and 2 have started bible studies.
If all the 300 recipients simply read the first 2 pages and threw the publications away, than, that is not success, it is simply a loss of resources.