Domains like that and blockchain.com were going for $200-$300k when this whole space was nothing but a fart many years ago---blockchain as we know it today wasn't even a thing back then.
If $200-$300k was paid without there being much of a market for it back then, how much do you think (think logically) these domains are worth today with how this space in general has grown x1000?
If that wasn't enough info, a lot of these domains were paid for largely in Bitcoin.... you can imagine how many coins were needed to acquire these domains with how low Bitcoin's value was.