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.
If your mind is neutral, you will not be biased by their signature.
I think of an opposite effects than you did, like by seeing signatures worn by posters, I can be more careful with their post contents and perhaps protection against companies that are hiring them for working as signature campaign participants.
I consider it as a good effect of showing signature in those boards. Did you actually think about it yet?