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RE: Steem Power explained, VESTS, voting power, vote weight, and inflation rate staking rewards
They are mostly early miners. In the first month Steem was under the radar and you can only get Steem by mining.
They had the foresight to jump on board early to take the risk when the odds were 50/50 for success and failure and today their efforts are paying off. I noticed many are techie also, which also helps!!