Because that's actual loot worth chasing. Cores are not loot, nor are they worth chasing to perform a basic practice of the game. Cores are there to disguise the shallow loot pool. I have over 200 cores, and still think cores should be removed from infusion. In the mean time, will I stop playing because of their involvement in infusion? No, I'll deal with them as long as I have to, which will likely be until the end of this game's life cycle.