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It actually did work within the first 2-3 mins after submitting the order. Instead of one power vote, you get several small power votes. Interesting. Anyway, this technic seems to be good to use. I've sent 0.5 SBD and got about 1 SBD back

Glad to hear that. And to be exact: what you received back is in $ - not SBD. So you should get your SBD back from the vote and get the rest as profit in Steempower.