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Any profit is earned from upvotes will be kept and used to pay for further promotion.

Sorry about that! But I do think this one answers you:

Every 24h a new post is created and may get promoted into regular trending using @Steemium promotion tool

It doesn't state it uses author rewards, but considering the costs, I assume it does.

Assume that votes cost more than they're worth and think again if your question make sense.

I'll try making it clear what post to upvote to support the authors.

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