[Ignored Knowledge]

Cores can be handy and awarding for lower levels, but as the characters progress in levels, the the usefulness of cores starts to dismiss to the point of people breaking down whatever it gives and or selling the items to npcs unless there's something that they cannot get normally. Commonly some of the items dropped are something that can be crafted, but to a point. (We don't have raw enchant-able forms of curses for example). Most of the time whenever someone is wanting cores, besides for making enchantments or burning it all for resources and wealth, it's usually for a certain item that can't be crafted or in hopes of getting something good out of all the other towering possible items. Like a purging flame. Or a certain item with an enchantment, possibility with a specific type of wood/metal, that can't be gained by craft alone. Getting those specific items could be extremely rare since the possibility of many other things being obtain from it can happen. Example: You can get burning bracers to a warrior ring to a purging flame all from a massive core.

My suggestion is that cores vary with drops on star ranking a bit more tightly or a rework. For example: Giant cores only dropping 5 up to 7 star and massive cores only drops 6 star to 9 (or 10). Not only for better drops but also for hunting items of particular interest of any star without the chance of all kinds of other crap to where you just hope you win the rate lottery.

Also to make the game feel like you can actually hunt for items (That isn't 10 stars) without feeling like you're just playing at a casino or pachinko as if every core is a metal ball.

[Sarinpa1]

This was adressed earlier on numerous occasions, I recall the answer was that the current percentages are apropriate given rarity of the gear.

[Neus]

There is a minimum rarity of items already, which I believe is half the rarity of the core itself. I don't think increasing the minimum rarity would solve any problem, just redirect complaints, as I've said in the past.