I'm not sure happiness is something that can be mathematically quantified like that, but I agree that upvoting several other good posts is more productive to the community than downvoting one bad post. Showing what you value is more useful information than showing what you dislike, too.
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Clearly you are unfamiliar with Fournier-Goldman Happiness units...
I am acquainted with the concept of utils in economics. It's similarly bullshit. But at least your happiness units are associated with a webcomic. That's something going for it.