it's quite the contrary for me, for the last 2 weeks i am getting almost 1 purple+ item per 2 days, that is a decent drop rate.
also Kemo i once once got 3 sage wands from the last sage, and another time i got 3 Healing stone (who were much needed at the time) and many other times i have got good semi-usable x3 good items in the last stage.
i am kinda curious now what's your definition of good?
Those are quite common in gold chests so that is not good for me. For me good is O1 items and shurikens/daggers. Thinking about it I think I got shurikens once but never O1. I got a decent amount of O1 in gold chests though. But I have also spent a lot there, in the order of billions.