Like Onix, I try to check in here every other day, although in practice my visits are a bit less frequent than that. There are some sites that have many more registered users than this one, and as a consequence generate a lot more traffic, the main ones in this category being RPGNet (AKA TBP, or The Big Purple), TheRPGSite, RPGGeek and Story-Games. Many of the regulars here also post in some of those sites, along with smaller ones like TheRPGHaven and Pen & Paper Games. I myself am on about eight sites, and try to visit them all reasonably frequently.
A lot of folks appreciate the calm atmos on sites like this one, where there are no flame wars, where threads don't go on for pages and pages, and where everybody knows your name. (Ok, that last one was lifted from the Cheers theme song, but you get the idea). This site is of course aimed specifically, but not exclusively, at folks who are interested in writing and reading about free games.
Then there are the lurkers, who for whatever reason don't actually join in the discussions, and at this time of year a great many folks are on vacation. So all in all, even though it may not look like it at times there
is plenty of activity, so don't think your posts and threads are going unnoticed

.