I honestly think that if you could buy from vendors on the app then if you are away from your console for a weekend you can still buy from Xur and it would cost the strange coins so it takes them from your storage/character.
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Yep. I fear the day that Xur is selling something like Graviton Forfeit and I'm not there.
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-blam!- no
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OMG!!!!! first time I go on this section exactly to say the same thing - we should be able to buy things from Xur without having to log on to our console to do the same thing.