well, I just said in our rules that they MUST have two blades, not technicaly wielding them at all times, only in fights and all.. that kind of stuff. And I have magic users in my guild and they have two blades as well, for close combat, plus, there are ALOT of magic users who uses swords too.
about leaving the guild, I like to know whats going on ofcourse, thats why I want to be informed if they are leaving, although, you are right, this system doesnt work for all members, only some, still, it works in some way...