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The fact that they are hard to buy makes for better curation and people will still earn Steem unless votes do as some do and set up an account that just has those tokens. I only have time to run one account.

They will (hopefully) easily exchangeable. It's on SMT whitepaper that they will use bancor-like protocol to easily trade between SMT to SMT and SMT to STEEM so there will never be liquidity issues.