There's a pretty good core of active users. Definitely not all of them. About 1 in 10 becomes a regular, with about 2 - 3% checking the site almost daily. Around 20 - 25% use the site once a month. No idea if these numbers are any good, but they're getting better every month.
When I initially started the site, I did some reddit advertising, and while I got a decent number of sign ups, most were one and done accounts. Organic exposure has definitely been way better than paid advertising for me.
