I don't think average people (so to speak) really care about their email.
Though I must say I find it funny all the different names/what exactly it is I've seen.
"Why would anybody do that?" For the lulz ("random acts of malice"), sadly.
No, they emphatically do not, at least until you explain that to them. And even then, it was "well, I don't really do anything important online anyway..."