I see this pack rat mentality pop up in every single online game I've ever played.

I understand, I really do. I have two crafts at 50, another above 30, and all of my gathering classes are > 15. I have an entire retainer who has seven pages full of cooking ingredients. But that's my choice, and my problem - there's no reason they should start throwing more storage at me simply because I don't want to get rid of my cul mats.

Inventory management has always been a part of RPGs. Learn to do it, instead of asking the game to do it for you.