I landed a mid xxxx name using this method, acquired for low xxx and sold on DL.Okay, this makes sense. Emails would usually be non-functional, often being on the same domain, but social/phone contacts should mostly be reachable. Attempts to contact previous owners by looking up their data were quite popular back in the day (especially when WHOIS showed the address), but I can't recall any big catches that way. I guess there were a few we didn't know about ;), but most ended up with the owner sending thanks for the reminder ;)
It is hard to replicate though as most of the time hard to track down the original owner.