Job Key.. Is the most important item and can be exchanged to Relic -the required materials to promote your heroes to the higher rarity.. It has very high demand because new hero is released once every 3 weeks.. And you need a lot to Limit Break, MTT and to make an Insignia.. Player without Prestige ...
I highly doubt the devs sit in their office with big hard ons over how to piss off guild members. it's all about coordination! it's really trivial to be honest just get your guild to listen to raid rules. Never experienced the bug myself but, if you're consistently having it (which i doubt) just me...