I've been reading feedback and I have a thought. How about cores are only required for infusing items over a certain power level, like 15 or 20 below the current max powel level. So, at 700 currently, you can infuse gear up to 680 or 685 without using cores. After the decided power level, current core costs are enabled. For the record, I don't really care, I don't play at the moment, and I have plenty of cores. I'm just trying to help with an idea.