Here's the thing though... he's wanting more than a fair chance at the loot because need rolls override greed rolls. Therefore he is getting a chance at loot his character cannot use on his character and making it harder for the other members of the group to upgrade their own gear. They have every right to boot him.
Free-will guarantees us the right to choose to behave in any way we deem fit. However, everything we do has consequences, some good, some bad. A consequence is not necessarily a punishment it is a natural result of one's choices. If you choose to flout whatever a community or group decides is a rule whether written or unwritten then you MUST deal with the consequences whether you like it or not. That is Life... deal with it.