Outbrain is not necessarily the network of choice, it was just an example. As for tracking the ROI usually you'll want to track campaigns in Google analytics and track clicks on affiliate links as event and average value/email or you'll want to duplicate the post and run paid traffic to the duplicate so you know exactly what the conversions are as you can put them in separate email lists etc too.
Affiliate marketing is one of the most popular ways people make money online. It is a strategy where an individual partners with a business in order to make a commission by referring readers or visitors to a business’s particular product or service. But that really is quite a simple explanation. To be really successful at making money with affiliate marketing there is a little more to it.
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.