As a relatively new player, I don't feel I have much experience with these kinds of things to tell. However what I have noticed is that in Ruby City people seem to be very open with tagging, and even if threads themselves don't reach 15 comments each, people tend to accumulate multiple threads that would add up to over 15 through the course of the month.

I don't feel that the new AC would require much more activity than people are already getting. I used to worry about not getting enough AC with Katherine because of AC requirements at other games, but I find that in RC people seem to like tagging around and accumulating 10-15 comments as stated would not be difficult at all.