Why not ban signature campaign so that people like you stop creating nonsense and redundant threads.
That would be a very poor financial move for the forum. Signature campaigns increase traffic to the website, and in turn, the number of impressions that are seen by ads. Removing campaigns would result in a drop in traffic as well as a drop in ad revenue for the forum.
That's not completely true. If you improve the quality of the posts, and of the active members, then the advertising becomes more valuable. Constantly advertising gambling sites, ponzi schemes, and other low end concepts, not only debases Bitcoin, but it also reflects badly on the forum.