I decided to look at the numbers the only way I know how: With big, complicated spreadsheets! XD It CANNOT be said that this is incomplete in any way, and sales over the last 3.5 years have been TANKING! And the crash is accelerating.
Data is is from Comichron, Diamond, and several other sources. Includes LCS shipments, non-LCS non-digital, AND digital sales figures, across the entire comic book industry, from 1997 through June 2018.