They are certain capable of posting much more than they do. On September 12, 2015 (a day that will live in infamy) we were subjected to Spampocalypse, a spam attack of unprecedented proportions. We fought them in GQ, we fought them in GD, we fought them in IMHO and MPSIMS, we fought them in the Pit. We never surrendered. Lo, when the smoke had cleared, more than 100 spammers had been sent to the Great Cornfield. (Well, 100 spammer names, but you know what I mean.)
They wax and wane a bit, but they’ve never approached than number again. So they evidently do respond to some extent to what they do.