I think my policy as a healer is that people are allowed to greed as long as at least one of the following conditions are met:
- you do it well
- you're my pal
- it's funny
luckily for the many melee DPS and black mages out there, I find almost every instance of greed funny as long as you're not toxic about it 
shoutout to the one SAM in Labyrinth yesterday who, upon seeing that enough of their party had made it to the pad to put the shield up, ran back in to smack Phlegethon around and died spectacularly for it
(fallen london stamps by