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...they are mostly done to qualify for the signature campaign. campaign managers mostly count long posts. because they look high quality.
Campaign managers who rely on long posts to pick campaign participants are like managers who look at earned merit of users in making their picks. If someone writes a long (and expectedly, boring) post on page one, there's a chance that it gets read unlike when that same post is on page 10 or on a mega thread. These are some of the little things that should mean something. Most times, these lengthy posts don't make much sense like the two-three liners and they get passed over more. What's the essence of making posts others don't bother to read?