Some managers simply don't care about them, do you know why? At the end they are still paid so they don't care if someone will abuse or not.
Or maybe, just maybe, that lazy managers are the one who abuse their own bounty with bots or people hired by the managers. It is just a “maybe” from me. This situation would be better if there are some standard to become a manager, and all managers are gathered in one association, so they will have rules and if they break it, other managers will punish them.
I think campaigns are the only biggest problem here in this forum. What if campaigns would be remove here on the forum forever maybe it's the only way to avoid users to make alts and also reduces spam and many of them would go offline and never to re-open their accounts. As i've read some topics here, the situation was always repeated all about spams, alts of anyone, etc.. so maybe it's better that way.