This board should be use to tackle scam and reputation without the influence of the signature campaign.
Scam accusation board is full of complaints to casino that has active signature campaign while most the user defending it are wearing casino signature campaign that gives a bias impression to the OP.
Same with the reputation board. Investigators, volunteer scam buster and other drama are being paid with an easy +1 on their signature campaign post quota that typically prolongs the thread due to unnecessary butt in reply for the payment.
Those who will disagree on this petition can’t do post without payment.
You also should keep in mind that Signature Campaign might be something that will motivate people to post in Scam Accusation and Reputation boards and the more users post, the better it will be for the OP to increase the awareness of the issue. But if there is someone who wears the signature of casino and blindly protects them when there are proofs shown, then such an user should receive a negative trust to my mind.
I nor agree, nor disagree with your idea. It worth a try but I don't think it will really do anything.