I too am having the same problem, It started after the Jonin TI's, nothing but purples.

Birth of the Snake easy normal Hard? Purple purple purple.

The Rinnegan's Pain? I'm on normal for it right now and still nothing but purples.

I wonder, since 4.0, it may be that since my level isn't too high, 81, it's on purpose? Perhaps to prevent me from being like those schmucks who sit at 79 or 84 and have ludicrous stats.

As we speak, through help from my friends, I'm finishing off the Monday ten TI's. All Pain Normal.

Three guesses on what all the items were. : (

Hokay, here's the tests I've done before I posted this up till now:

5x Birth of the Snake EASY = 5 purple gear, zero gold even appearing in the list. More purple stones.

5x Birth of the Snake NORMAL = 5 purple gear, zero gold even appearing in the list. Mix of purple and gold stones.

5x Birth of the Snake HARD = 5 purple gear, zero gold even appearing in the list. Gold stones for the most part.

THe Rinnegan's Pain EASY & NORMAL 5x each. All purple gear, zero golds appearing at all.

Akatsuki Appproaches: Easy Normal Hard, 5 x each. All purple gear, zero golds appearing at all. Mostly Ramen and coins for bottom rewards, 2 purple stones total.

40 attempts over two weeks, mostly through the help of the big guys above me.

40 purple items, 9 Gold Stones, 6 Purple Stones. 12 Ramen. The rest coins I think. Might have been a dango or two in there.

At this point, I really think it's my level, I'm currently 81, and I think I'll experiment further. I'll try to get to 32000, as I"m at 31572, and see what happens with the Brothers.

If it is my level, it's an attempt to prevent new accounts from snagging gear and power and causing imbalance in the Whale hunts of Sage battles and the like.

Easy enough to test if you have *t of low-ish level and high-ish power.

Cheers,

Update the final:

I made it to 32044 power, and, on Monday I got help with Brothers Easy.

5 Purples just like before. 5 attempts meaning 25 purples showed in total.

But then I wandered off, got to level 82 and guess what? In the afternoon, the other 5 attempts... Regular drops. Golds and Oranges.

So yeah, it's level based. I'll try doubling back to some of the earlier ones, but at Brothers Easy, you need level 82 before it starts dropping the golds+

Now we know.