There is an invisible 10 minute timer on the 3oC - if you kill an ultra too soon the 3oC gets consumed but you have a 0% chance of getting an exotic.
So for example if you are farming the silent scream ultra in the dreadnought (that takes about five minutes per) you're wasting half your coins.
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I'm aware. Unfortunately, that doesn't apply in my case as I wait the recommended amount of time before popping the next one. I've just been shafted since the initial nerf.
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oh that sucks. My luck suxxors also.