[fireattack]

I think he meant that your karma on your account won't affect your posts. (And I agree.. you can even see the karma of the poster without clicking into his username.)

The points you got for a particular post of course matters, since it affects the visibility.

[nullc]

Many subreddits have automod set to hide (or hold for moderation) posts/comments from posters with below some threshold karma.

You may not even know this is being done to you because it uses a shadowban-esq mechanism where the comments remain visible to you.