I have read somewhere on reddit that if you put something on the mannequin in a FC house and someone else can remove housing items, that they can remove the mannequin and your gear will be gone. Not 100% sure if that is correct but it would be quite bad if that is the case. Also sad to see that such a system is again not even complete and will need rework in the next patches. Cant we have a system that is just done when its released? Also why did we even need all the "sell it on MB" features anyway? As far as I can remember, people just wanted them to show of gear and glamour. Nothing more, nothing less.
SE dont try to invent the wheels again and again.