I think you guys should let accounts link to each other, if not, you will make this game unbalance when steam has discount to region when yours are not. For example right now, BDO on steam sale for ~16$ for legendary package while on web is 40$. Either, when top up with steam, user has always get the cheaper than who used web top up. That's mean steam user will always get advantage than client user. For longtime, client user will stop playing game because of this imba.
Please reconsidered the situation right now.