I noticed the drop-off too and really just chocked it up to the time of year. Everybody been busy trimming and jarring and stuff, others finished their grow and lost interest in yucking it up about weed and moved on to bark at and chase the next moving car passing by their house.
I would expect a bump around Thanksgiving and Christmas with people getting time off and dreaming about weed again and then a pickup in the spring to stay focused on the topic of weed and plan their summer grow. Not everybody runs plants all the time too so you probably get ebb and flow of people doing runs. Just drawing presumptive conclusions on what I would expect traffic on this site to look like.