its not - just make pt with low lvl toons and u r able to farm them
I farmed lvl 90 mobs and drop rate was low with CM, 100% drop Scroll, 100% server bonus, 100% HH bonus, guild bonus, pet bonus and premium bonus altogether.
Jugg base components sure aren't farmable with some guys spawn camping them 24/7 but at least all the other ingredients you can farm freely with moderate difficulty. The drop table is too big(sub-stat) for nm jewels so its alot harder. Farming cores from lvl 80 mobs in ET is easier than farming NM jewel parts(specially [Con] and specific sub-stat).
Oh and here's how carus grade looks like in english :