The more traffic you have, the more money you can make with ClickBank. In order to maximize your traffic, you should spend some time identifying commonly searched keywords that relate to the product you plan to sell. If you create articles and other content based on those keywords you can often get some traffic from search engines, especially if you target the less competitive long-tail keywords in your niche. 
Now, I know what you’re thinking. Most of the software and apps you use on a regular basis are made by massive companies or established development studios. Well, yes. But many successful apps, particularly those in the Apple and Google stores, are created and marketed by individuals and small businesses. In fact, independent developers made $20 billion in the App Store in 2016 alone.
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.