There has to be an increase in supply to create new users. Every crypto generates new currency to reward miners or other people in the community. This crypto rewards people for contributing to the community and some for the miners. Essentially 90% of the new $$ created is used as interest for anyone holding steem power and the other 10% is for the content creators. You can see if you hold steem power you will generate interest. Essentially the currency is hyper inflated, but as long as there is a growing demand for the currency then it will balance out. If demand stays the same then there will be a decrease in value in the currency.