A few reasons I think.
We don't really let people on here with fake log in's. We regulars have real info about who we are and don't hide behind a computer. We don't post or put up with a lot of bs or nude stuff. A lot of guys get on other forums just to be smart a??@$ and we usually run those off pretty quick.
It's usually kinda quiet until somebody starts a big scam thread or some other crap. Always a bunch of post when that kind of stuff is going on.
I hope the economy is a little better for everybody and they're able to get back to the lake / river, vacations, racing, etc.!!!
Also like harb said, it's summer and it's been really nice outside for a while.