I think most of the "guests" will be webbots, search engine crawlers and spam-bots. I delete several account per day that sign up to try to spam.
I agree the forum is very quiet these days, I think many forums are, things have moved on really. Everyone seems to prefer facebook groups these days.
Also I think G40s are getting very thin on the ground now, there seems to be very little coming up for sale where as a couple of years ago there was always a few knocking about for sale. I think a combination of them getting scrapped and perhaps some being stored away.
I have no plans to get rid of the forum though, it costs me next to nothing to run and takes little of my time.