why would you gather all those things when half of them are sold in venders in all cities not to mention at your fc house vender.??

yes all 1 star mats are worth stockpiling at least 99 of each.

if your actively crafting for blacksmith 2 star then your gonna burn through darksteel pretty quickly so will want more. maybe more than you can gather yourself in a reasonable time depending on sales. same goes for crawler cacoon and gold ore. buy up hippogryph skins when there cheap cus there needed in a lot of recipes as well.

really you'll have to learn the mats for the things you sell the most off and make sure to keep those on hand.