I think I kind of get what you mean about this (I hope I'm gonna get this right).
Basically, when I applied I suggested something called "Categorised Competitions" and basically what it would entail would be is that if a competition is posted, but has a specific subject area (e.g/ Photography, TV, Habbo) these competitions wouldn't just sit in the Competitions forum it would also be exploited into its relevant sub-forum categories such as "Other Graphics, including Pictures & Photography" or "TV & Film" I felt like this is something that would encourage comp entries due to more people viewing sub-forums like Spam than the comps section.
I don't know if this is what you meant but this is how I would of thought you meant by advertising???