What would you need wardrobe valets for? Take a lawyer for example, he wears pants and a polo into the office but needs a suit for court. He has a place to hang that classy suit until the time is right and also keeps the casual nice and casual, not nice and wrinkled when he returns.

How about an active executive? He may need to go to a court also. Of course we mean the tennis court in this case. While he's out playing, his business attire is wearable upon his return.

Maybe you're very meticulous (obsessive or efficient) and you like to set out what you're going to wear the next day. A wardrobe valet is much better than laying it on the end of your bed...unless you're a very restful sleeper, it's bound to end up on the floor.