He sells three of coins for exotics so why not skeleton keys for strike specific loot
Edit 1: or increase drop rate for skeleton keys
Edit 2: xur probably shouldn't sell them but they should increase drop rate
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I agree the drop rate should be higher, but not by much. Those keys aren't for easy leveling, they're mostly a bonus loot deal that only happens occasionally. If you've ever played WoW, they have a similar system built upon by tokens and a dice a roll, only it's more random.