I'm still lurking and check in once or twice a week when I can. I do go through busy spells where I'm away from home, or just haven't got the time to check in regularly.
But as MM and Laveila says, you get fed up answering the same question time and time again for newbies who can't be bothered to use the search function. Unless it's something I feel particularly passionate about, I tend to just sit back and let them get on with it these days, so that does limit the number of times I post.
It's not something unique to this forum either, it happens everywhere. It's just sometimes hard to keep the interest going I guess.
That doesn't mean I don't like reading about others experiences though. There's always something new to learn. 