What is? Why?
Because the forum is an interactive discussion group for positing ideas (particularly the campaigns subforum....), and the wiki is a reference source for informing those ideas.
At least, my impression was that the wiki was intended as an encyclopedic reference source of useful 'factual' (within FS context) information, not another discussion place for random ideas.
I mean;
Earth: The Ongoing Fury
Description: The GTVA thought that Earth was lost to subspace; they were wrong: Basically, the idea is that Sol is accessible to the GTVA via the Shivan Nebula; the newly-formed Terranovan Confederation must defend Earth at all costs. The Campaign is a prelude to Reconuqest of Earth in the Post-Capella ideas.
Exactly what purpose does this serve? What person, capable of making a campaign, will go with someone elses idea and concept rather than their? Be influenced by an idea, perhaps, but following it exactly....I can't see it happening. This strikes me as a rather pointless wishlist rather than useful.