How do you think the STEEM model would work?

I'm always getting frustrated when a see some big pump (STEEM's rise in price was not natural), because a lot people are dragged into and eventually leads to big (if not huge) personal losses. I did some fast research (like 20-30 mins) on STEEM and the way I see it some posts could earn like $250 to the original poster. As far as I understand, these money should be paid by users, not by STEEM itself.

According to this graph, Facebook earns about $3.73 per user on average, on every three months (i.e. ~$15/year). FB alone has about 1.65 billion monthly active users, which means that their revenue is about $24,618Bn/year. Yeah, but it's seems that this math is wrong, because according to several sources, FB's revenue for 2015 is around $18Bn. I only have 2 questions.

1. Why do you think a post on steemit should worth $250?
2. How they will deal with posts containing illegal materials?

My personal opinion is that STEEM is doomed to FAIL.