I've done 25/30 total since Rise released and I've only got 3. It's really not too hard to believe... I wonder if Vanguard streaks or 3oC have anything to do with the drop rates (negatively).
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I always do like 10 strikes in a row, and I get one key and one exotic out of 10 pretty much every time, sometimes two. And I did plenty of 'em, have one 385 and one 384 char almost exclusively from strikes, so I found it weird, but yeah, it can be possible, I guess. Again - no offence, just my opinion.