You know there are players that have been playing/crafting much longer than you, myself included, and I haven't heard many people overly complain about the crafting mats. sure they can take up space. We have two retainers for a total of 350 slots, and more if we buy them monthly.

All I can really say is know what's worth holding onto, and know what's just worth selling to a vendor/ect when they're super easy/cheap to get, and you just don't want them taking up space.

Plus if you take the time, for right now, to get all crafting classes to level 40, you can use Dark Matter (Grade 5) to repair ALL end game gear. That was my main reason, so this way I can even repair in the middle of a dungeon/raid without worries.