Well I have posting a lot lends itself to more karma than not, as in eventually I write something intelligent and interesting enough for people to up vote. The majority of my comments sit pretty at whatever the default is with an occasional soapbox that I post knowing it will get nuked.
As far as stories, sometimes you can post too early and another will follow with a similar story and it runs up, submit what falls under the guidelines that you truly want to see discussed and you might hit karma gold.
Myself, my wish list for HN is a feature I can flag stories for my later review; a save feature like reddit
"Myself, my wish list for HN is a feature I can flag stories for my later review; a save feature like reddit"
Are you aware that upvoting a story saves it? You can access 'saved stories' via your profile. On one hand, you might argue that overloading the 'upvote' function isn't quite what you want, but the counter argument is that if a story seems interesting enough for you to want to read lead, the upvote's probably deserved.
As far as stories, sometimes you can post too early and another will follow with a similar story and it runs up, submit what falls under the guidelines that you truly want to see discussed and you might hit karma gold.
Myself, my wish list for HN is a feature I can flag stories for my later review; a save feature like reddit