1. what do you think? would the amount of users decline after signatures would be disabled?
i think yes.
...
Let's make a central platform for the signature campaigns and let's make the signatures prevalidated in the forum.
I mean, if someone wants to run a signature / bounty campaign, then:
1. hires a trusted campaign manager
2. validates the signatures (can be different from junior to legendary)
3. the campaign manager enrolls the users, who will automatically get the signature of the campaign
4. the mods have to focus only on the dedicated users of the problematic bounty /signature campaigns
5. If someone is spamming the forum, mods can remove the signature easily
I don't know if it's good or bad for the campaign managers, but it's just an idea.
It would prevent to let everyone to become a campaign manager and start to manage shady bounty campaigns. (I can imagine that today some newbie becomes a campaign manager and if he has e.g. 25 alts, then he can spam the forum with copypaste posts and take all the bounties for himself...)
So to sum up, starting campaigns would be a case of prior permission, so those campaign managers who allowed to the members to spam the whole forum would not get the permission -> less spam (ideal case).
If someone wants to have an unique signature, then it can be also done but in that case he has not to belong to any of the signature campaigns in the system.