If you're saying A) I ignored the cryptocurrency, unfortunately you are wrong.
If you're saying B) I didn't explain to you what a sybil attack is, you're right, albeit I did provide a link.
In a global unique namespace that has no centralized control, there needs to be constraints and scarcity built into the system itself in order to prevent someone from launching a "sybil attack" which, in this context, means someone could register a trillion names without anything stopping them. By introducing a coin that in itself is a limited resource and including an auction process, essentially, there are a limited number of names since there are a limited number of coins, and, in addition, the auction process itself helps to prevent someone from getting a lot of coins and registering many names.
This explanation really just touches the surface as all the intricacies of the architecture are better detailed in full, in our project design notes [1] as I have continued to urge you to read.
[1] https://handshake.org/files/handshake.txt