I know what you mean, that's why I proposed Hive to reward writers based on the content, I mean if someone wrote a 7 minutes content should be rewarded on how long a person's spend on their post, also the reader should also be rewarded on how long they spent on a post. Which means if the post is 1 minute long it cannot gain more than the reward/time /person. And voting should be something extra like a tip or adds validity or rank of the post. So those commenting two words will not get any rewards.
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That is advisable, but again sometime some people write short content occasionally but something very meaningful, valuable and knowledgeable so it would be hard to classify such contents. On the commenting part most of the people do it with the intention of gaining visibility but in the bargain they are spamming and bringing down their own reputation