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why is it so expensive? how many steem coin total?

8.1(ish) million total coins.

And why is it so expensive? Because it is a social network (based on bitshares 2.0 graphene technology) that pays people who lock away their steem and become wealth distributors who get to pay out to those who have quality content :)

OK , thank your information share. maybe steem have a future like reddit, reddit valued between 500millions to 4billions dollars .