I owned 8gb a while ago and had a site on it doing flash drives, ram, memory cards etc. I made low xxx over a year or so on it.
8tb hard drives are a year or so away, 5tb and 6tb are around now. I believe WD are talking about a Helium Filled 8tb drive.
I'm not convinced its worth much to resell as a domain due to the limited scope, but maybe worth developing, and perhaps sell on revenue.