If you lose, your funds are returned in full (minus the Handshake Mining Fee). If you win, congrats! You're now one of the first owners of decentralized top-level domains on the internet. Companies regularly pay more than $200k to apply to register top-level domains with the ICANN, so it's pretty cool that you own your own top-level domain.
You can now point your top-level domain to a personal webpage, set up subdomains for your top-level domain, or sell your top-level domain to someone else for a profit! See namebase.io/use-cases for some ways you can get started using your name.