Not exactly true.
You get the right to down vote and if I promote my totally not a scam product on HN, people will check my user account and see: on wow over 9000 karma? Gotta be trust worthy, when in truth it's just been karma farming.
HN does limit some of it, but it's not a panacea.
I don't know, never found much value in karma. I recreate an account at least once a year for no particular reason and it roughly takes me a week to get enough karma to do what is important (flagging posts).
My account is literally 4 years old and I'm not even halfway there.
How do you do it?
And I'm trying to limit myself from saying unwanted things like criticizing ** or saying something nice about **. (Self censoring to avoid downvotes).
Maybe I should be more active.