Probably half and half. I read less than half of the stuff on HN now.
Part of it is a lot of it is not new now. I've read a lot about the lean startups, or joel's ben and jerry vs amazon, or mel the programmer, or the 500 mile email. I've been here long enough to have seen repeats of the same themes. As you grow, the less things surprise you, and hence perhaps less interesting.
And the other part is that I don't really care for the apple gossip, or a picture of woz, or the lighter stuff, but then again, I've only sporatically submitted stuff too.
I've noticed you've submitted less stuff and don't participate as much. The edw519 era has gone, where you submitted stuff and commented. Nowadays, it's the patio11 era, where he submits his own stuff and comments.