Merit system implies promotion quality post. Most of messages of deleted/off topic are useless. Just these guys are using merit for promotion accounts in such way. That's fraud.
I disagree. Fraud is where there is "mens rea". (Definition: The intention or knowledge of wrongdoing, as opposed to the action or conduct).
They were using the merit system in a different way to it was intended but not without the same goals of reducing spam in mind.
Does it prove or disprove something?
I never concealed this secret of a political man. This is not prohibited by your own rules, which you try to ignore.
Rules also state that account sales are discouraged - which implies that there is a potential consequence.