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Nothing - it's just that by increasing it from 25% to something higher, it becomes more of a problem.

I'm not saying the problem doesn't exist currently, but this compounds it and makes it worse :)

It's not a problem to use reputation into the equation - that way exploiting new accounts will be considerably harder.

Using reputation allows someone with a higher reputation to upvote someone with a lower one and do the same thing.

Not impossible, harder yes. Will people do it. Absolutely, if the rewards are large enough and the time it takes to do so is negligible in comparison.

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