I agree that you don't need a title to help people, but like Whiteroom said, it's a lot easier for a newbie to identify players that are willing to help if they have a mentor icon next to their name.

@Toguro
I definitely agree that 40 hours is too short for a player to be considered a newbie, but think of that mentor period more as an icebreaker. After they're no longer newbies, you can add them to your friends list, or make a linkshell if the player would like further guidance into the game.