I do understand wanting to make the service available to a wider audience. That's why I suggest keeping it open, but limited to one upvote every 12 hours (with a white list that removes that upvote restriction).
Another alternative would be a white-list for higher bids, so that low quality authors are limited in the upvote they can get. This would make your problem worse, though (more low-quality posts at the lower limit).
Have you done any metrics around avg. bids by quality level? Having some insight into whether the bidding patterns are different for different quality levels might make it easier to make a plan that boosts quality overall.
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