The truth is that I have not heard of any big sale of cyber insurance domains yet. CyberPolicy.com and CyberClaims.com were sold only for $15,000 and $12,000
I am sure that today we are on the beginning of cyber race and year by year we see really big sales.
I checked ReInsurance.com - owner General Re Corporation and ReInsure.com owner SouthWestRe.
but also:
Cyber-ReInsurance.com owned by Risk Manager from Germany, not developed yet
Cyber-Re.co developed by Cyber Reinsurance Brokers.