Is it possible to get yet? It's needed for only 3 things as far as I know, so it should be more common. As few other materials. There is no point even think 'bout Craft some items, if some materials costs like over 500ce! it's still CBT and Crafting is 1 really important thing for some people, I don't mean every material, like everfrost, Philoso Feather, Snowball etc should drop with every second kill, but should be more common.
The cost of the materials is what the players decided. We're kind of limiting our own ability to test in that respect :/
Philoso Feathers have been dropping. Just kill more Kats, unless they drop from a different monster now.