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At present, account wide, I have 34 Black Lion chests and 5 keys, all from drops. So 34:5 for me. I hae six characters, level 40, 30, 10, 10, 10, 5.
I haven't opened any of them yet. I figured they are supposed to have crafting mats, so I will wait till I start leveling crafting. I don't plan to buy any keys.
(1) What is your box:key drop ratio?
(2) What do the boxes contain?
(3) How useful are the contents to crafting or whatever?