Or maybe you've looked mostly at the IM-related and MMO-related products (for the sales of which - obviously enough - it's sometimes difficult to be paid all your commissions because people tend, understandably, to buy them through them own hoplinks rather than through the hoplinks of the referring affiliate), and ignored about 298 other niches represented there?
The process of getting a backlink is a bit different for each option listed below, but you can’t go wrong here.  The idea is to do three things: get a link to your site, use your keyword phrase in the description or tag when you’re using a bookmarking site, use your keyword phrase as the “anchor text” (the text that’s clickable…that is the actual link to your site) whenever possible.  Don’t worry about getting this perfect…any link is better than a perfect link, and you can do no harm!
ClickBank allows you to join for free, and the approval process is virtually automatic, so it’s a great choice for people entering the affiliated game for the first time. ClickBank has a ton of information, including FAQs, walk-throughs, and videos available, so the barrier to entry is quite low. There’s also a (paid) program called ClickBank University with courses and assistance from experienced marketers.
How much will you make? I think my best month with Google AdSense was almost $5,000 over the last ten years. That amazing month blew my mind since it was actually near the beginning of my blogging journey. When you go from making zero to $5,000 in a month, that will rock your world. For me, it also got me even more excited because I knew there were other ways to monetize.