I got bored. So I did a quick Google search. Surprisingly 990 different people on Google managed to think of the different ways as to why people failed at affiliate marketing.
How about instead of thinking of the 'what didn't work' paradigm, how about thinking about what did work?
So often we are focused on the negativity that we overlook the positive. In every moment we do something we can learn from that experience.
You can go google "failed"...