Just thinking out loud - but I think the way Web3Domainer is valuing MetaverseCasino.king interesting.
They compare MetaverseCasino.king to Casino.king, but the latter was sold for 5.5m nearly 2 DECADES AGO, when the internet was still quite young and online gambling was JUST becoming a thing.
I think it's fair to say that the domain Casino.king is worth at least 2 - 4 times as much today, because of how much the industry has grown since 2003. A single gambling site can pull in hundreds of millions of dollars in revenue a year, with on a mediocre brandable domain, so 20m is just a drop in the bucket by comparison.
MetaverseCasino.com is 2 words though. Would a better comparison be to OnlineCasino.com? The price of that sale wasn't made public though unfortunately. OnlineCasino.co.uk sold for 165k and Online-Casino.de sold for 144k, 13 and 10 years ago when online gambling was starting to reach maturity.
I would estimate personally that today those names may be worth 2 to 3 times the amounts they sold for. But keep in mind that they are only the .co.uk domains, not dot king.
So It could be that Web3Domainer's price of 2.5m isn't may not be as outrageous as it sounds.
Just my take but I would be interested in hearing other's thoughts on this, especially if you disagree.