I think a self-vote is a payment to one self with little expectation for future reward.
Voting for someone else has forward reward expectations like a bigger or healthier community.
I think they both have their place.
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They do both have their place and I upvoted my posts, but not my comments when I first started on Steemit. But now, at least in my case, it just makes more sense to upvote others. Helping them find their footing by curating their content has created value for others and because of that value, they upvote me.