You pay a fee for each transaction you send, just like any other service. b
However, your holdings increase in value the more other people use the same chain because the value of the entire ecosystem needs to scale proportionally to the value people are attempting to transact across it.
Financial systems, like social networks, and most businesses coming out of SV rely on network effects for much of their value.
USD has been the default option for the world, and enforced through violence when people attempt to create their own networks of trade.
The positive sum value that cryptocurrency is attempting to create is the ability to send anyone in the world any amount of value (money or otherwise) not subject to government permission, or sabotage (ie money printing)
It's like any one being able to suggest a Federal Reserve policy, and the vote being handled by the people, not representatives or a committee.
It is revolutionarily democratic.