These accounts that you manage are solely for signature campaign purpose only?
I wonder, how an owner of such account would entrust their account when it's risky that they you might change their password.

I would not do that in my case as I value my account like I value my reputation, if I feel I don't have time to post in the forum, I just keep my account and make sure no one touches it, just to tell you, I have trades in the forum also so I don't want to compromise my reputation.

Just out of curiosity again, how many accounts have you manage so far? What ranks, and what's the rate you are getting?