I replied with this to a fellow in PTR Feedback.
For as long as the game has two categories of items “the good stuff” and “utter trash”, then if drop rate of the good stuff is too low, than people will turn to botting or real money purchases.
Since its inception this game suffered from this weird dichtomy of being specifically set up to provide no items matching the difficulty setting they were found at. Which is why ‘Magic’, ‘Rare’, ‘Crafted’ and majority of set items are trash.
What needs to happen, in some form, is what I suggested in PTR:
If that does not happen, than nerf to rune drop rate will just make people more desperate for other means of getting their items.