The guild furniture (assuming thats what you are looking at) doesn't give you the element bonus from what I remember, instead it gives you a skill boost. It will still contribute towards you getting the element bonus but you can't have both active at the same time so which ever is stronger will cancle the other.
wind aura for instance reduces the chances of losing materials when synthesis attempts utilizing a wind crystal have failed
and that is all
and to achieve it, you will overwrite Moglification: Bonecraft
until one gets a signboard, it can help stop loosing expensive mats