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The value of your upvote is dependent on your Steem power only.

Upvotes to your posts comments will increase your reputation based on the Steem power of those upvoting.

I guess technically you can up your rep by voting on yourself but couldn't say for sure.

The reputation of those upvoting is also important.

That's interesting, I thought it rested solely on the stake of the user.

I'll have a look into this further. Thanks for the info.