The community in this game tends to need on gear that isn't a direct upgrade BECAUSE this game is designed to make gear appealing to all characters of all levels.
In WoW, you either wear armor, sell it for a tiny amount of gold, or disenchant it if you happen to be an enchanter (which most characters are not). Other mmos I've played let you smash armor into dust, which might be used to create upgrades, but never the best stuff in the game. So when you run a dungeon and something drops that isn't an upgrade, you have no logical REASON to need it. 20 gold or one extra enchanting crystal means nothing in terms of character progress.
In FFXIV, armor can be sold for high amounts of GC seals (only way to get moonstones and relic items), converted to materia (used by raiders and relic weapons), desynthed into valuable components necessary for endgame equipment, or worn by classes you have yet to level to 50. Want battlecraft demimateria III? You need to win rolls on armor that you can desynth in level 70-90 dungeons. Need a moonstone for your supra tools? Either grind a dozen fates in level 50 zones, or turn in 3 pieces of level 100 dungeon gear.
Now sure, rolling need on things I can ONLY turn in for seals is pretty selfish when I'm already sitting on a decent stack of moonstones, but for people who don't like running fates, it's a valid option. And I'm not going to pass up the chance to get leather working and armorer gear to desynth, especially since I'm still leveling those up.
So this isn't "other mmos". Everyone has something useful to do with gear they win. If you think your reason is more important than others, go ahead and ask. If you say nothing, don't be surprised when I need on armor and desynthing it in your face.