I've been gone too long to know what all the random drama in this thread is about right now, but I agree selling lootrights in PUGs when participants need the loot is a bit wanky.
There isn't much that's as demoralising as being the only doc for an entire beast run, desperate to grab a boc (haven't played since the days it took a year of pande raids to farm points for one) only to have a green win the roll and immediately post it on neutnet. However - once I discovered selling LR in pugs was a thing - it isn't difficult to ask the person inviting you if selling is allowed and then politely decline if so and I've seen a few people running raids where selling is allowed but only on the 2nd or 3rd roll which is a bit better for need vs greed.