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18+ Million Steempower are currently being delegated by Steemit Inc. towards projects.

2000 Vests are roughly 1 Million Steempower.

what do they do with their delegated stake to make money for themselves in those projects? Selling votes via smartsteem for 85% because they cannot use @booster with 100%? Or do they circlejerk some spam-comments automatically like haejin?

I think it is more honorable when projects are invested in with money and a contract instead of delegation or vote-games.