MemberPress is a feature-rich plugin that will enable you to turn your WordPress blog into a fully functional membership site. Depending on how you want to run your membership site, you could have a mixture of free and premium membership plans. Premium plans could include no adverts, free downloads, access to extra content, membership forums, and much more. However, it is important to remember that if people are going to pay to view your content then it must be high quality. Otherwise your members won’t renew their subscriptions when the time comes.
If you have pop-ups and optins on every page, I would have to think that it would be a lot harder to convince someone to link to it. Especially since the pages where you have your optins (and probably receive the most traffic) are probably the same pages that you have your best content on as well that you'd be hoping to pitch in your outreach campaign.