First, thanks for the responses Brendan and Jason. Makes sense.
I'd support that as well. If I've sent like $100,000 in leads at a network and never had any fraud problems, etc, I personally wouldn't feel so hot about feeling like I "owe" it to them or anything to keep running traffic if I want to keep my account at any given point in time. Although I understand the points you make; fine line to walk. Not really faulting any network for cleaning out inactive accounts, just personally wouldn't feel great about getting that email if I had done any decent level of biz in the past with the network.
Also in another thread there was an affiliate who mentioned they'd run traffic with you guys as recently as three weeks ago and got emailed about having their account deactivated -- don't know if that's accurate or not, but if it is, surely this must have been an error of some sort (seems easily possible considering everything was CC'd instead of BCC'd in the first place), as you wouldn't can an affiliate after three weeks of inactivity?