It's interesting to keep track of some known people. Sometimes you get to see (for example) a thread with cperciva, tptacek and animats - and I think it makes it more fun to read when you know...
This is basically 99% of hacker news comments in a nutshell.
Apart from sheer volume (I have been a message board nerd since FIDONet when I was a teenager, it's second nature for me) I attribute what success I've had here to engaging principally on security topics, which is where I've spent my whole career. But I also just like to shoot the shit about stuff! I'm wrong all the time! (Including about security stuff).