To be honest, who cares. Even if your motivation was karma, if it's a good post we can upvote, if not we won't. Until prizes start getting awarded for karma I'd

To be honest, who cares. Even if your motivation was karma, if it's a good post we can upvote, if not we won't. Until prizes start getting awarded for karma I'd hope most people don't care about other users getting karma ('deserved' or not), even if they do care about their only karma. The only exception here would be that you don't want karma driving baity content, but a "no karma post" option wouldn't help fix that at all.