Tezos is cheaper than other cryptocurrencies because it takes a different approach to the way it is structured. It is a decentralized, open-source blockchain platform that allows for smart contracts and decentralized applications (dApps) to be built on its network. Unlike other cryptocurrencies, Tezos does not rely on miners to validate transactions, instead it uses a consensus protocol called "proof-of-stake" (PoS). This means that users can stake their coins to help validate transactions and earn rewards for doing so. Additionally, Tezos has a self-amending protocol that allows it to upgrade itself without the need for hard forks, making it more secure and resilient to changes in the market. All of these features combine to make Tezos an attractive and affordable cryptocurrency.