I get so many followers with this pop-up that I wrote about here. Bloggers who want the same results sign up using my affiliate link and I get $20 per sign up AND I also get paid if someone clicks on the pop-up and makes a purchase even if they never read my article. I explain more in detail here but it is by far the EASIEST affiliate program to make money.
SkimLinks is probably best for bloggers who want to write content around the affiliate link rather than add affiliate links to existing products. SkimLinks offers a lot of tools to compare commission rates and offers in order to customize your content to optimize your income. Once nice aspect of SkimLinks is that it offers lots of products for non-US creators, including popular UK brands like John Lewis and Tesco.
Affiliate marketing is and always will be a brilliant business model. Where I think it really has power is when you market products you use and love yourself. When you become a true ambassador for a product that you use yourself, the buyer can tell this, and they are far more likely to buy from you, as opposed to someone trying to sell something through an affiliate link simply for the reason of trying to make money.