Dr Who was a recent 12 player game and had a roughly 30 page day 1, and I don't think anyone in that game would argue it was spammy at all; it was also one of my more restrained games too and I had a little over 5 pages of filter, very little of which I would deem unnecessary - the lynch ended up being between 2 mafia, brought about by conversation and participation.
The fact of the matter is that people need to argue for their lynch and potentially pursuade ~20 other players; people change their mind, etc. etc. I find it hard to believe that, say, a 3 page filter is excessive in a day cycle.
EDIT: e.g. syllogism had ~50 posts on Day 1 in Fruity Mini Mafia, and I don't think anyone ever argued syllogism was a spammer.