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I try to do the same thing :) I for one don't upvote stuff in order to get rewarded for it, but I can also see why some people would do that. At 100k+ SP the curation rewards are very high, so "randomly voting" can cost hundreds of dollars in lost rewards for them.

Well, randomly voting would be like a donation to someone else, but a donation requires you to spend money, whereas an upvote does not. I understand people want to benefit, but stinginess and greed is something I just don't get.