My best friend and I have been testing this 'drop rate'. It seems to be somehow directly related to the player using the coin. He averages about 1 in 5 and has yet to go 8 with 0 drops. He also frequently has rare and legendary engrams decrypt up to exotics. I on the other hand have had rare & legendaries pop exotic maybe a half dozen times in all my time playing, and average about 1 exotic engram every 8-12 coins. I'm currently at 21 coins popped since 2 days ago and only 2 exotic drops. He has had 2 drop in the last 4 hours. So it has nothing to do with time played, or rng, or percentage increase over progressive duds; as bungo claims. It seems more likely that a player's likelihood of yielding exotics is based upon an rng roll at each character's creation, that doesn't change thereafter regardless of modifiers. Which is utter bullshit. Whether that speculation is true or not, the mechanic is definitely broken. Otherwise my success:failure rate would change if not daily then assuredly at every weekly reset, not remain piss-poor for months on end.