Different groups will have differnt rules. I have heard people stating the rules to be, orb user get all drops or drops / 6.
Anyway, i dont think its lame. Think about this, if you are the one who keeps providing the seals all the time, will you feel good? I know BCNM its about teamwork, you can argue that "Without the other 5 members, you cant even win" but then again, will u feel good if u keep providing those seals, and getting 1/6 of the gil? Maybe you do, but at some point of time you will began to feel like this "Hey, where am i the only one who keeps providing the seals" or stuffs like that.
Everyone can take turns to use their seals, lets say, a group doing a total of 6 BCNM fights, (1 member using 40 seals each time). This will take up quite a long time. Not everyone got that time to spare. The purpose of this static PT or LS, is to help you to get gil much faster. It's like this scenario:
(Assuming they already know the rule: Orb user gets all the stuffs)
GuyA: Hey you free now? Care to help me out in BCNM 40? I am providing the seals
GuyB: Sure!
GuyC: OK!
GuyD: ok!
GuyE: OK!
GuyF: ok!
GuyA: Thanks! Call me if you need help in any BCNM.
What if Guy B or any other guys aren't free? Thats where LS comes in, where you can find another replacement. Hopefully, there will be more people interested in this idea and more BCNMs will be done.
On a side note: Equipped the LS only when you are free/wanted to do BCNM. BST only LS for BCNM? maybe add in a few bards?