Its more expensive because you can get items that you haven't gotten yet.
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Yeah i know, but you are still getting only one item which is a 1 out of 4 or 5 chances of dropping. Where as a reroll i can complete a full raid and get one. The cache however you would have to run the raid 3 times to open one and get just one weapon or gear.
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Armor doesn't drop high from them tho. I had a 56 legs drop from tbe cache.