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Not everyone prefer to earn 5$ net instead of spending 10 and getting some visibility.

This is $100 not $10.

Steemium reports $34 used to buy votes. That's way more than needed to get a reasonable visibility jump start, and probably doesn't count all the bought votes.

34$ is USD so 34*2/0.6 = 133 SBD

I say spent 10$ as example because that's about the cost after downvotes.