Yeah, the number 8 will always sell for a good price, it doesn't matter what the extension is. This sale is about the number, not the extension
https://en.wikipedia.org/wiki/Numbers_in_Chinese_culture
You only have to look at past sales to see that
358.com 480,000 USD
800.com 250,000 USD
88888.com 245,000 USD
880.com 188,889 USD
248.com 175,000 USD
458.com 140,000 USD
w8.com 140,000 USD
8788.com 106,000 USD
84.net 100,000 USD
8008.com 58,889 USD
8808.com 51,111 USD
f88.com 39,000 USD
s88.com 35,000 USD
9888.com 26,258 USD
848.com 24,000 USD
888.ca 20,000 USD
8988.com 16,300 USD
888.be 16,200 USD