Signature campaigns should be a way to reward users for quality contributions and only those that do should be paid, but at the moment it has become a way for many campaign operators to lazily and cheaply advertise their business by paying greedy users to spam whatever unsubstantial rubbish they can be bothered putting the minimal amount of effort in to and this will no longer be tolerated.
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As a signature campaign operator you will ultimately be held responsible for the quality of posts of users bearing your signature advertisement and you will need to monitor your users closely or it will be quickly abused.
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Running a campaign is not an easy task and it requires someone actively monitoring participants daily ~ If you cannot commit to doing this or do not have someone within your company who can do the job to an acceptable standard then you should either hire someone to do so or close your campaign and look at alternative ways of advertising.