I think $1billion is a fair price.
Never in the history has a domain ever sold for anywhere near that amount. Roger has to include his whole empire, and it still wouldn't fetch a billion.
It's not easy to utilize that domain. It's great and all that everyone agrees it's valuable and powerful, but that also requires a relentless businessman behind it, which Roger is. How many people similar to Roger we have in crypto?
I'm sure Coinbase would turn it into a shitcoin platform where they ask noobs to complete tasks and courses in return for $20 worth of tokens of a project nobody ever cared about.