I'm posting with my real first name at least...
at first I thought you are joking now I am ???
I don't know about you but I have dozens of emails, my "real" one is the one for people I take seriously and close friends.
I only have a couple of email addresses. I'm not worried about someone knowing my email address... Why would I be? I comport myself online the exact same way I would face-to-face. If anyone is sending me annoying/abusive emails I can simply block them. But that has never happened...
It's not just emails, I collect all manner of information in local cache so that I can search it.
I haven't done this on this site, but on other places I've used this to identify some subset of people that I want to contact. Superficially, that sounds like spamming but I'm not sending mass messages or advertising or wasting people's time or contacting people that don't want to be contacted.
Of course, if you put your real email here you're a little crazed.