If you're interested in the idea of EOS, it's important to understand that the EOS token that's being traded right now doesn't correlate in any direct way to the EOS dApp platform and blockchain that will, ultimately, be launched.
The currently-existing EOS token is an ERC-20 token – a token on the Ethereum blockchain – that was created for EOS's ICO. It doesn't – and can't – have any use on the EOS blockchain because it's not on an EOS blockchain, it's on the Ethereum chain.
However, the developers have said that the current EOS tokens will redeemable for tokens on the EOS blockchain once the EOS mainnet launches, which is expected to happen in June 2018. The expected rate of redemption is 1:1.
But it's worth pointing out that no redemption is guaranteed, and EOS's website clearly states that the tokens “do not have any rights, uses, purpose, attributes, functionalities or features, express or implied, including, without limitation, any uses, purpose, attributes, functionalities or features on the EOS Platform.”