Regarding zaephirian "edit" addition.
Great idea about also requiring more to purchase a key such as also requiring a legendary engram, since I've seen some comments that just legendary marks is too little. That plus some amount of Legendary Marks (we need something else to spend them on) sounds fair while not making it to easy (fast) to stock up on skeleton keys.
[b]Suggest: [/b]1 Legendary Armor engram AND 1 Legendary Weapon engram AND 100 Legendary Marks FOR 1 Skeleton Key.
[b]One other suggestion[/b] I read elsewhere: Add a weekly quest to earn one key (per character). Similar to the Tyra Karn's weekly quest for class items, but give it to Shiro-4 or Saladin. The quest could complete some number (5?) high-level strikes. This way farming for keys (an exercise in futility) will always net you at least one key per character per week.
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I wouldn't go as far as to quest, fragments, AND purchase, but any two would work.
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I meant one or the other, not both together. Marks (or marks + engrams) would be my preference but a weekly quest (instead) would limit the number of "guarantee" skeleton keys. Also, I think the precedence has been established with Tyra's weekly quest.