Its not going to make any difference if they appoint multiple manager for their campaign where actually chances of changing shitposters habit is 1%. Managers only can follow strict selection process to choose best participants for their campaign. If you want to educate low quality poster than its probably a meaningless try. Yeah its true that sometime its hard to go with a proper selection process but managers have the power to remove them or disqualify their post.

For yobit if you just look at its best side then i can say that we have been introduced with a lot of shitposters and you can easily find them by visiting yahoo's thread List of banned participants in the Cryptotalk Campaign and actually i am not seeing the necessity of having multiple manager.