I would not do 50 trade ins unless I had like 500 to do. But so far I've gotten pretty good rolls.
[14:39]50 Anemos crystals exchanged for 153 protean crystals.
[14:39]50 Anemos crystals exchanged for 161 protean crystals.
[14:39]50 Anemos crystals exchanged for 243 protean crystals.
[14:39]50 Anemos crystals exchanged for 225 protean crystals.
5/7 have been above the the 50% average rate.
If that were the case I wouldn't have gotten a fscking 243 (Like holy shit that's good). Its likely very, very simple.
You turn in one for 2-5
You turn in ten for 20-50
You turn in fifty for 100-250