The Mount and illusion Key Ring features are nice, but how about one for all the various travel clickies in game. I'm not sure if this has been suggested yet at all, so excuse me if it has, and i missed it.
Supposedly there were going to be more keyrings coming, now that they've done the hard work of making the feature possible.
They need to reserve such things to be defining bullet points for upcoming expansions. Something they can use to justify $120 special editions by adding additional slots.
Thus why you can pay 40 or less for it. The most recent one was available for just $35 (less if you are an All-Access member). The extreme price you are mentioning was for one which included all the various bonus items.
i'm aware of the tier pricing for expansions. I'm just stating in my personal opinion there is nothing that justifies paying $120 for an expansion.
You don't have to pay $120 if you don't want to. If you don't think there's a reason for that version, don't buy it.