I don't see why anyone needs a reason at all to do it. We bought the phone and if we want to root it we do. Off the bat I only had a few minor uses for it but I wanted to do it as soon as possible anyway. Coming from htc they have a bad habit of changing the bootloaders regularly to kill the exploits. I learned the hard way to do it and do it soon.
If someone asks why you needed it just tell them there's a difference between want and need and that you wanted to do it. End of discussion.
Wife walks in...
Wife: Hey what are you doing?
me: Nada, phones finally rootable.