Earlier quoted context omitted.
Whois privacy email addresses will forward incoming mails to you as well. A buying offer can be a smart way to probe the owner behind that privacy wall, who I guess most of the time is just a normal guy/gal...
Interesting.. I didn't realize that, as I've never bothered to pay the extra fee for the "private" registration. But I do use a less-important GMail account for the email contact, so at least my main email doesn't get swamped. But the phone number on there is actually my personal cellphone, which could be annoying if a lot of people started calling, but so far that doesn't seem to happen.
(Can't reply to this below).
Want to point out though that once the info is slurped and appears elsewhere you won't be able to put the genie back in the bottle.
I many times pull up old info for domains in search.