If anyone has any luck finding good MI’s with rare affixes, you probably have quite a treasure. Why is the drop rate for these items so extremely low? It’s like finding a Mirror of Kalandra in POE. Also, if you want to farm a specific boss for their MI item like i’ve been doing you get maybe 1 drop per 10 runs. It’s a pain in the ass enough to get the MI to drop, but then you gotta contend with all the different rolls of rng. Imo if the double rare affixes are as rare as they are, shouldn’t bosses at least have a higher drop rate for their specific MI? Farming Galakros The Mountain for his Dread Plating and it says on grimtools it only has a 7.5% chance to drop his MI. This is crazy for such a non competitive game. I love the game and ive invested 1200 hours into it over the years its been released, but come on guys, this stuff should be a bit easier to acquire.
Stop farming for double rares, they aren’t needed. If you are farming for a specific double rare combo you will just be disappointed.
Best way to farm m.i.'s is to just farm them to farm them. Pick every one up that drops, then when your session is over look at them. Keep the ones you deem worthy.
There are many rare/magic combos that make superb items. And there are many magic/magic combos that make pretty good items.
Double rares do drop, but its obviously hard to get a good double rare combo
Because it’s the endless carrot on a stick. The loot for people who already have all the loot. Some of us wouldn’t have it any other way. 
Double rare MIs can be nice, but they won’t change your life, and many of them aren’t even that good - as sfbistimg says, there are some fantastic rare/magic affix combos out there, and you’ll come across them a hell of a lot more than double rares. Make those your goal instead. 
I understand there are decent magical affixes, but still, rare are always going to be better. It’s just something that irks me the wrong way when a combination is possible but is basically a pipe dream of ever attaining without cheating.
Get GDstash
Yeah, I keep every MI with a rare affix… I pick up every MI and sell the yellow-only ones… well unless they are useful on their own like some of the nem or rogue-like boss drops.
That’s the point then isn’t it? Double rares are generally going to be better but they are rarer to compensate. Some of the absolute best gear in a loot-based ARPG doesn’t come easy you know (nor is it required to make good characters).
To some extent I agree with op. I don’t care much about MIs. Builds that use MIs for their unique base stats usually do ok without specific double rare affixes. But there are builds that are crap without that Stonehide SG of Arcane Winds and with it they’re top tier.
But I’d like to take this chance to talk about another iniquity: Al-fucking-kamos rings. 0.8%? With 7-9 minutes per run? Come on… that’s straight up sadism!
I hear ya. Got one a loong time ago and gave up on farming for the other 
I meant, get GD stash for making the double rare MI’s