[pugworthy]

> ...doesn't really mean anything and doesn't make your posts more valuable..

True for posts, and true for comments if they get upvotes. Downvotes however make comments less valuable. I imagine some people see the gray/faded comments and just presume low value content, which may not be the case.

[pmiller2]

I have showdead turned on, and, while you're right that most greyed out comments are low quality, there are a few that are just inexplicably greyed out. I vouch for these whenever possible, even if I don't necessarily agree with the content of the comment.

[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.