It comes at 500 karma. You'll have to wait a while. And if you mean the article, then you'll never get downvote. There is no downvoting articles. Only flagging.
I will probably never get to 500 because the only way I can "downvote" is to post a challenging, dismissive, or otherwise negative comment. Which people don't really like. Since I don't care at all about karma, I also cannot be bothered to carefully craft intelligent-seeming pedagogery, to humble-brag, to spam, or any other form of whoring, subtle or blatant.
Oh well.
Karma-whoring will be counterproductive if the community doesn't solicit/reward such behaviour. And this attitude of the community has more or less thwarted karma-whoring till now. We'll see how this works out in future.
Really? How do you realise it is carma whoring on such a high niveau portal? I see many comments stating the obvious getting their upvotes, not contributing anything useful to a topic. It is still carma whoring, just on a high niveau. This is what such a system creates and it forces you to scroll more to find the really useful comment. I know it works, I did it too ;)
Removing the system completly while integrating a clever report-system would have been more useful here imho.
Generally formulas with no application or truth to them are avoided. What I think you mean is "With great power, comes great responsibility" It's subtly different, but "the devil is in the details."