Carbonti daily challenge

I would think it's because those are the easier pieces to get (as far as availability and purple gear). It's basically a grind that F2P and lower levels can make. I mean, there are still plenty of lvl 85 players that struggle on LS9 hard mode. I honestly haven't noticed a change in drop rate, but haven't paid much attention to it either. I still push one toon at a time in gear. But there is at least one player with all G11 toons. And enough higher players with maxed out toons requiring those same pieces that it's doable. There are even F2P guys that have made the grind without complaint. So it isn't as if it's unattainable.