Why not include merit requirements in signature campaign?
I think if we ban signature bitcointalk will be cripple for it was started for a long time with signature campaign and more bitcointalk followers change lives from nothing to something.
Next, require the bounty manager to be more strict than before. Make the requirements harder.
Actually, high paid signature campaigns have already had different payment rates for users who meet merit requirements and who don't. Most campaigns which paid in Bitcoin require merit points to join.
And their requirements for post quality are also high, too.
I think merit system has performed well in signature campaigns by its contributions to prevent low qualities but high ranked members to ask for joning.