There is no money "out of nothing in bitcoin" at all. You don't earn Bitcoin by stocking Bitcoin.
You are able to know how much BTC are exactly in circualtion with a Total Market Cap
Larimer's currencies is another story. I admit it still remains a mystery for me. BTS STEEM EOS are unlimited.
RE: Is Steemit Generating Wealth or Are We All Simply Spending Someone Else's Money?