I believe that AM's that remove low or non-productive affiliates are truly missing a great opportunity and are showing a complete lack of experience & understanding.
As an AM myself, I focus on contacting non-productive affiliates and see what we can do to assist them in becoming a more productive affiliate. I have seen a non-productive affiliate turn around and become 1 of the top 20 marketers for a program we manage after working directly with the affiliate!
And, as Leader stated ... if that one time non-productive affiliate happens to gain a SERP
spot that turns their figures totally around ... the inexperienced AM that dumped the non-productive affiliate has then led that affiliate to a competitor AM that is super happy to have that affiliate onboard ... and the affiliate remembers how the "inexperienced AM" treated them and will generally never look back to that company for marketing their products.
When you receive a notification that you have been removed from their affiliate program because of low stats, conversions, etc. ..... you should send them over to Andy for a real education on how to work with affiliates that are non-productive ... they obviously need good training ... that's my opinion.