In order to make the process of updates and distribution easier, I've opted to make MetaScan a freemium product. So now validations are free to use but social previews will cost a one-time $4.99 purchase to unlock.
I've had relative success with Twitter ads to see if developers are interested in an extension like MetaScan. I saw a 6-7% click rate on my Twitter Ads which based on past experience is a good rate. CPA was sitting comfortably at $0.40 per click.
There's definitely optimizations to make in terms of the CTA to buy a license etc. But I'm glad I'm making steady progress :)