The domain was purchased at $70 in 1999 and Sold for $400K in 2021. This is an insane ROI in 22 years of patience.
No doubt still Domain names are the best secure asset class.
This domain was not purchased in 1999.
This domain was registered in 1999
and $70 was the standard registration fee for the first two years, i.e. $35 per year.
Thousands of other domains were registered at the same time and expired, because nobody needed them. And they also paid the same fee.