I like to know members by their first names at times, or at least know what they are. I was surprised that the copywright name doesn't appear in their profile. Instead I have to search for a post of theirs to see.
I think the profile should contain the "real name," as it's one of the most important things you would want to know about a person... right next to "interests" and whatnot.
And it's not like it violates anyone's privacy... people who don't want to use their real name, or have it known, usually don't put it in their profile.