Bitcoin also keeps itself alive by printing more Bitcoin. Any currency requires inflation to motivate its survial. Maybe you should Google up on game theory to understand what motivates adoption of currencies.
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Bitcoin actually has a definitive amount of coins, that is known as a "controlled supply" on how many will be available in total. There are many things that help a currency adopt and maintain a value. In cryptocurrency, things like the security of the coin, how many there will be, and what projects it is used for can fluctuate the price. You can learn more about the limited supply of Bitcoin itself here c:
https://en.bitcoin.it/wiki/Controlled_supply
All that matters is market cap. If there's a limited supply, then the price of each unit will increase instead.