Games & Rounds not count toward posts or activity.
Definitely a yes. Those posts do not deserve to be counted and are mostly what I'd classify as spam (or sig. spam).
Maybe Off-topic, though some decent discussions occur there, so I'm not sure about that.
This is already a harder proposal. I've seen and took part of some decent discussions there, albeit they are mostly polluted with people that have signatures and do not read any previous replies.
Auction
I concur.
Might aswell include
Lending in that list.
I concur.