Well this is part of it.
Most of those threads are just FYIs of sales from particular sellers and we have, generally, contained them to their specific threads (KaOTiK does a great job of updating the Steam sales thread for example) and not only does it inform the relatively small group in PC Gaming who may not ever visit Hot Deals, but it helps foster discussion and a bit of a community feel in what is a pretty quiet sub-forum.
Hot Deals is used just to grab a particular game/deal and the extraneous discussion is not allowed; the threads in PC Gaming more often than not lead to greater discussions of the games, which is something I would like to encourage, not extinguish by closing the threads.
KT