I would post my levels and stuff like Bryan does but nobody really cares anymore :P So I don't either. Maybe if they're really high levels or something I might post them.
Just because people don't reply, doesn't mean they don't care. I like seeing the posts but I don't know what to reply. Feels like posting Grats! on every achievement posted would get a bit weird.
I don't care about the lack of replies, I want an archive for ME to access, screw y'all! As for others posting their levels, it's always nice to see 'em, even if people don't seem to care about them.