I just received this email today.
Perfect example of where sponsors will deactivate:
"Important Information Regarding:
Affiliate ID(s): XXXXXX
Webmaster Program: Mistress Jessica's Affiliate Program
Your Affiliate account(s) has/have been deactivated due to click inactivity.
I noticed you haven't made a single sale in the three years that you have been an affiliate of my site. Since it's obviously not benefitting either of us, I have closed your affiliate account.
Jessica
MistressJessica.net"
And I remember the exact reason why I never sent much traffic, is because those FHG's are not supportive of many tgp scripts.