I just happened to notice when I posted the Pages Module (Group Clone) in the Market place and created the support forum for it, that postings in the Market & Job category do not show in Recent Topics.
Why is that? Is it because they do not want Market 'support' topics to flood the recent topics area? I would suppose that would be the reason, but for some people that check the forums more than the Market, its a good way of knowing something new has been added to. Just a thought.