Easy to make items like the silver needle will never be valuable. If that needle required a rare mat sure it would become valuable but then no one would skill up on that. People will always exploit the cheapest and easiest recipes to skill up on.

I agree with some of what you say however, it's a similar idea to what I push where each item that is designed to be valuable includes one rare mat. Not every item or mat needs to be valuable and rare and I believe craft SP is too low not too high. It should be difficult to take a craft to the cap.