Sounds like you ought to use a loot council or a raider>trial>alt/pug policy. Rolling for loot is generally a poor solution, because this doesn't take into account what you (as a guild) need to have geared and who benefits the most from the item etc. A 20 strength upgrade vs a 190 strength upgrade for instance, 50% of the times the rollsystem will give you a 20 strength upgrade and the guy who had a huge upgrade to be had should rightfully feel a bit sad panda. Assuming both were contributing the same to the guild as a whole etc ...