ranles, I assume that your point about email addresses was aimed at me (among others). My correct email address is registered with Flyertalk but I choose not to display it in my profile.
The reasons for this include to maintain my privacy, to reduce spam (for the same reasons I don't like multiple posts) and because if I wish an individual to have it, I will give it to them. Making people publically display their email address is clearly unacceptable and unneccessary.
James