The cap is ok. HQ materials help you a lot when you're crafting. If those items become easy to obtain, the HQ crafting will be more common. Why? because, in order to get HQ crafts, you need, as Yuki said, all your cross skills OR!!! HQ materials (and some cross-class skills). That requires effort and time. ALSO, leves give you more exp if you give them HQ items/crafting (200% extra exp), so you will level up really fast. If you craft HQ things faster due the increasement of drop rate of those things, everyone will max their DoH and DoL classes in no time (It's fast even with the current system). The economy as you know it, will blow.