For my Adsense plugin which you can get here https://wordpress.org/plugins/adsense-made-easy-best-simple-ad-inserter/ I’ve created a PRO version (https://www.seo101.net/adsense-made-easy-pro/) that is available to those that sign up for my mailing list. It’s not much but it gets me 5 to 6 subscibers a day. And best of all I know exactly what my subscribers are interested in… WordPress and Adsense:)
By creating valuable content, you help people to make a practical decision. This will build trust and reputation for your website or blog, and your website will become a popular place for people to visit. Google will rank your site higher in the search engine, and thus more people will find your website. More visitors means more buyers and this will turn into more profit.