I never make a single useless post and secondly that's my primary source of income now.
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?
I
do not take control over accounts, I write posts in a notepad file and provide to the accounts owner and mention how to post them (example quote reply #12 this post) and it's really easy for them.
I work for really high ranked accounts and honestly speaking it depends on what they need, if they are just farming account and need posts I would write rather compact posts and obviously charge much lower.
That seems very contradictory. If posting is incentivized and a necessity, then you cannot guarantee absolute quality.
At some point, all discussions (that you have the knowledge to comment upon) will be tabled and any further input made irrelevant. In that situation, what would you do?
Not create insubstantial replies? I doubt it.
Even for someone like myself who
doesn't rely on forum posts for income, I know I have made some irrelevant posts.

I agree with you but in our day to day life we don't mean to do everything with an intent of contributing. I mean we do a lot of things which makes us happy as long as it does not hurt someone and I believe my post writing won't bother anyone since it's impossible to find out which ones I wrote and hence I am doing good.