I think there is a problem with BOE epics and need/greed system at the moment. These items still go by need system, which on one had ensures that people that can "use" it can only roll need but on the other hand it means those people can "need" it and sell it later without other party members having chance to roll on it.
Blizzard should make any BOE epic drops in 5-man instance convert to BOP to be truly compatible with current need/greed system.