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RE: As the russian hacker would say: You've been leaving comments all wrong. Now I show you the right way.
I usually upvote good comments myself, but I'm pretty sure what it is is the curation rewards. People want to vote on things that they know/expect will get a lot of other upvotes on, so they get a bigger curation reward. Most of the time comments tend to yield smaller payouts, so people see it as a 'waste' of their vote.