So I wanted more Miranium to invest into the AM's (Arms Manufacturers). I heard that leaving your game on would give your mining probes plenty of time to harvest more, but when I woke up after a good 8-9 hours of sleep, I only had close to 3,000 units of Miranium, while my max is 9,000. Am I doing something wrong? should I rubber band the left analog stick or something?

I believe the game only gives you miranium while you're actually playing. It can tell if you're idle, and I've heard it can also tell if you're doing a rubber band kind of trick. You'd probably need to find a way to keep the stick moving in different directions while you're away.

@hamborgini: I saw this gif on reddit titled "Miranium farming: Extreme Edition," and it was someone's gamepad swinging from their fan, and no one said that didn't work xD

Yeah, can't just leave it at idle.

For me, I found the gear you buy from well-invested Arm's Manufacturers are more useful than most of the drops you get from indigens. At the max level of investment, the AM's gear get two additional attributes.