Each upvotes you give in a 24 hour period drains your upvoting power. The lower the power the lower the reward. So while you could upvote everything until the power is drained, each vote is likely to bring a smaller return.
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Thank you very much for your comment :-)
Actually some minutes after I've sent this post I noticed the bar under the name indicating the upvoting power ^.^
So here the mechanism limiting the upvotes... they get less important if one spam :-)
Great concept
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