Very simple really. We've all lost time with Xur due to the Lizard -blam!-ers. So do you think Xurs time in the Tower will be extended?
Edit: Thanks for most of your responses.
Edit: Now down since Friday and only on for a short time today. Surely that warrants an extension.
Edit: boom! http://www.bungie.net/en/Forum/Post/87590434
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In the case that they can't fix the servers or they can't extend him they should have him sell what he sold this week again next week but also sell the next set of items too so basically doubling his inventory next week. Not a perfect solution but if they need time to implement it that could be an option