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That is a great point. Is there a mechanism for that, though? Can you make a "paid post"?

Ah, I see. You buy a lot of steem, power up, and then you upvote your own posts. It would be a strange model for advertisers, though: You'd have to pay a whole lot of money in advance, and then get an unlimited number of (slightly?) promoted posts. Eventually, you could even make the money back, or not?

Ads sell product which generates capital, they are an investment tool