Let's use common sense. If I feel you deliberately post crap suggestions I'll downvote you, not because they're crap but because you deliberately harmed the signal-noise ratio.

I don't think that would work if you tried (posting links to everything). It may naively seem like that is being incentivized but from my own intuitions about what I would do if someone did that and that fact that that hasn't actually happened, I don't think you need to be concerned.

I agree with both your points. I disagree with the premise that people should be encouraged to maximize karma, or that this will be a significant problem, or that karma votes will be given primarily on the basis of how much users enjoyed the recommended content.

I didn't realize that I was suggesting 'posting links to every piece of media ever produced'. Maybe we should be discussing an addition to the rules about that since apparently it's a problem.