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So how does Steem earn money if he/she doesn't post, doesn't curate and doesn't follow anyone? #confused #feelingdumb

Really it is a question. How?
I think there is more to learn about steemit.

I dont really get it either. I always comment on other peoples post and post as much as I can and my account worth is $160 used to be $200 but dunno what happend

That i can sort of understand as the $ value is based on the amount of SBD you have and the exchange rate between SBD and $ fluctuates, but to devalue by 20% seems quite a lot. So the other reason is probably the $200 was based on when you first posted something on day one you get a bigger slice of the reward pot, but by day seven more people have posted as well and they get more upvotes than you which eats into your share because there's just one fixed pot.