I think you caught a scammer. "Up for sale" is a VERY common prelude to a craigslister either moving hot merchandise or trolling for email addresses and phone numbers. They'll cut and paste from other posts to build a new one. I could be wrong on this one, but there is only one posting and zero reply to your question (zero visible to me, anyway).
I just bought mine for around $7000 from the bmw dealer with alarm and navi but it got 25.000km so it's like bit more than 15.000 miles. The whole time was maintained in BMW service.
BMW dealer in Hurst,TX. (Ft. Worth) has several brand new 2013 ones for sale at $6999. Three year factory warranty, no miles, just leftover ones that did not sell. Great deal.
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