The real reason why Steem will make you rich is the low 'velocity' of Steem!
I just saw the post from Alex Fortin about the inflation rate of Steem. He explains that the annual inflation of 100% is largely put back into the community and therefore this inflation is not actually inflation of your purchasing power. I thought that was a very good point of Alex.
However... I think the real reason why Steem will make you rich is because of the low 'velocity' of Steem!
Let me explain: What Alex says is only true when people convert their 'Steem' into 'Steem Power'. Therefore there is a very big incentive to do just that. Not doing so will most likely result in loss of purchasing power. At least in the long term. In other words, any newly created Steem is quickly locked-up in Steem Power, and therefore not available for lowering the price of Steem. It's practically not being added to the available supply.
So, besides being compensated for inflation by getting more Steem in your 'Steem Power'-account, the price of Steem is also driven up because any newly created Steem is quickly taken off the market and shall not become available any time soon after it is converted into Steem Power.
This means that the 'velocity' of Steem is VERY slow, which is very positive for the price of Steem. After all... the same single Steem can only be spent once per year or less.
After I realized this, I was not afraid of the inflation rate of Steem.