You may have heard of ClickBank, one of the oldest and most popular affiliate networks. A billion-dollar company, ClickBank specializes in digital products like e-books and software, as well as membership sites. If you are comfortable selling information and don’t want the management and administration hassles of “real” businesses, this may be a good starting point. Its commissions can be anywhere from 10% all the way to 75%.
Ask for VIP (sometimes called “tiered”) commissions. Many affiliate programs have different commission levels. Usually the standard commission level is made public, but higher commissions are offered to higher performing affiliates. Sometimes you may be bumped up to “VIP affiliate” status by the advertiser, but most times you have to ask if there’s a higher tier and how you can get there.
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.