I don't know why there is no concern that most (if not all) signature campaigns are related to gambling, the forum is less diverse and the number of campaigns is less and therefore no matter what your rank is over time you will have to post in sections or specialties that you don't like.

In other words I don't think there is a problem in finding good members because there are a lot of good accounts without paid signatures and since there is a lot of demand and less supply (fewer campaigns) campaign managers can set any conditions without problems.