I watch my karma on reddit and HN very closely. It is very rare that I get reflexively downvoted as a result of initial voting, and when it does happen, I mention it and clarify my post and almost always see it even back out.
Edit: Downvotes? WTF? I'd like to know who downvoted this. At least post some constructive criticism.
I didn't really ask for your judgement, but since you've taken it upon yourself... I don't "game" karma. The few posts that I've editted here to inquire about downvotes have usually resulted in a further discussion supporting my point, or at the very least opening up further discussion about areas of contention. As it often turns out, no one had bothered checking the child comment below me that said "No you're wrong because of [obvious statement].", when in reality it turned out that actual evidence or a simple screenshot proved my stance.
If I edit my post and point this out and inquire as to why people downvoted me without supporting their position...
That's me "gaming karma"? That's a sad stance. I should just let people say that Chrome 11 lacks H.264 support when a very simple test and very minimal amounts of research prove otherwise? What would you have me do, but edit my post and plea that people take a second to research what they think they know rather than just recalling the infamous blog post that was on HN for a week discussing a phase-out of H264?
So I'd rather chose to not have any votes and actually get something out of other people's votes than to have an impact that nobody can actually see.
The point is that we want to be able to see karma relative to the rest of the thread. If one comment in 20 has 150 upvotes, it means we should at least look at it because what is being said might be important.
Building on your idea: why not also have the downvote count revealed after pressing up/down/pass? That way we can also know more than the net score tells us.
What is the problem we're trying to solve again, anyways? And do the multiple downsides mentioned here multiple times (and heavily upvoted each time) really outweigh the downside of whatever that perceived issue is?