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Mostly lack of comments and feedback, people that just love to write do it so that somebody will actually read and find useful or interesting what they write about... they don't just do it for the money (or the reward here on Steemit). Sure, nobody would refuse to get something in return for the time spent writing, but a good post that you make that has 0 comments even with a few hundred SBD reward is really not that satisfying... at least for the people that don't do it for the money.

Here on Steemit you often get the feeling that not many people actually read your posts, I have discussed the need for Post Views functionality, other users as well talked about this, but it is starting to feel like such a feature is not being implemented intentionally... just because the numbers will be really low and discouraging and not very far from the number of votes our posts are getting (even when a vote does not necessarily mean somebody has actually read your post).