I have played 4 hours worth of strikes, 2 hours of Siva Crisis and 2 hours of Heroic Siva Crisis, and have only picked up a single key. The only benefit for me to do these are to open the chests at the end but with such low drop rates, it isn't really worth the time. Incredibly frustrating.
Edit: picked up my first skeleton key since October 19th. It is now November 3rd. So far i think I've picked up a total of maybe 6 keys since roi released. That includes the 3 from the quest line.
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You make it sound like 4 hours is alot of time for a strike when it takes roughly 45-60 minutes with an average strike team to complete one heroic. In reality youve only done 10 strikes. 1/10 strikes is regular rng at its worst. You make it sound like youre supposed to get 3-5 keys EVERY 10 strikes, which would just ruin economy by increasing your light level by like 30 in 3 days of grinding. Just saying.