I believe this is because of the new monetary direction the game has taken.
Items from Bazaar are only available if your account has purchased item. The results vary across items, i.e. armours cannot be worn, or picked up. The Arcane cabinet can be accessed by classmates, but not picked up, and yeah the horse is unridable.
Even if a clan mate creates an item you do not have access, unless your account has also purchased the item. No more sharing of newer cosmetic items. (new direction for Funcom/Tencent).
There is a good thread about this here.
link:: This owning of cosmetics system is not ok
hope this helps.