Why aren’t MMOs monetizing mobile apps?

I’ve been playing online games for as long as the genre existed and have slowly made the transition from “I will never play a free to play game” to “I could totally pay $25 for that cool mount”  What I want to know is why none of the big MMOs that are able to make enough money to continue to add content are not capitalizing on mobile apps?  I’m absolutely obsessed whenever there is a mobile app for the game that I’m playing.  It helps me feel like I’m more connected to my character.

Have you done the fashion show micro event in WoW?  It puts you in a room with a few other people and you dress up your character based on a random theme that it selects.  They are usually along the lines of “summer” or “winter” or “faction pride” and you go from there!  The last time I played this event it was the only thing that I wanted to do, to the point where I got every armor set of ever armor type on several different characters.  Why is this game not a mobile app?  Do you know how much more time I would spend on my transmog if this was a feature?

There are tons of other MMOs out there that all they have is cosmetic gear.  I could imagine an app with your character model and being able to try on gear similar to how you can in game.  Am I crazy for think this might be popular?  Would this be hard to do?  I know next to nothing about game design so knock me down if what I’m talking about would be crazy expensive.

Also being able to do WoW pet battled would make that part of the game amazingly fun for me if I could do it on my phone.  When I do them in game currently I’m just reminded of playing pokemon on my green gameboy pocket and being able to do it in bed.  I want to play pet battles from the bathtub!  Yes I know I can play the real pokemon but I love the idea of being able to advance my characters in the MMO that I’m playing while not having to sit at my computer to do it.