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Kinda. I think putting a poll should involve spending some karma points.

If a poll cost 50-100 karma points to create, anyone who posts a poll would make sure they were interesting.

You're not spending 50 karma, you're investing it. If your poll gets 51 upvotes, it was worth it.

That's actually not quite true. Over some limit (maybe around 20), upvotes stop counting directly to karma.

Also, it would be fun if karma were actually good for something.