I've been looking through guides online. And I understand the XP cap for weapons on tiers 1-3. And I also get that to get the most out of your materials to get the x3 multiplier, and the best is the one costing 50,000g. My question is what should I do with all of my other materials that I have gotten from monsters? Should I sell them for gil to buy the better materials? Or is there a reason to keep/use them.