https://www.epublishing.com/news/2012/dec/18/322-paywalls-vs-revenue-diversity-5-ways-to-make-m/epublishing.com comments: Comments for 'Paywalls vs. Revenue Diversity: 5 Ways to Make More Money Online In Addition to Putting Up a Paywall'en-usWed, 12 Mar 2025 15:12:19 +0000