Who determines the price of domain names ?

For example , consider a scenario where someone unknown buys a domain and
creates a website on that domain. The website then becomes very popular. The
registrar notices this and when it's time to renew , asks for a much higher
price for the domain. The domain owner can move to a different registrar but
other registrars may also notice the situation and do something analogous.
Are there any mechanisms (for some TLDs) to prevent such a scenario ?

--
Reunited at last, Oya and Yuri savor their first night back in each other's
arms by making love until Yuri passes out from exhaustion.
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