The more you want to share something, the more you want a bigger reward out of it (not money in specific). If there is no bigger reward, there is no incentive.

Vote hoarding on the other hand is an issue, since you can get a reward even with zero effort. Many are spamming comments with no real value, hoping for votes. Which is why comments should not be getting as big rewards as vlogs/threads. I swear, I got twenty times more out of comments than I did out of my topics.