Weeding out affiliates?

[LandL]

I was thinking of going through my list of affiliates and checking the sales they made and seeing if I am actually being promoted on their site. If an affiliate hasn't made a sale or I don't see my galleries on their site, is there really any point of keeping them as an affiliate?

Affiliates: have you ever signed up for a program (or programs) that you've stopped promoting? Or don't really make any sales from? And if so, would you care if that sponsor contacted you to say they are going to delete your affiliate account since it obviously isn't beneficial for either person?

Thoughts?