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With the option to hold an ICO, I believe that will raise some of the initial capital and give the tokens their initial value, but the reward pool I think will basically come from inflation, just like it does with Steem, which is primarily delegated to the authors, curators, etc... In Steem, all of the reward pool are tokens that are just created out of thin air per day, according to a known inflation curve. Hope that helps.

That's true, initial investments will give value to tokens and afterwards the growth of that token is depends upon the demand and supply, and also market capital and supply.