The points are from made up/hijacked accounts, or they are purchased through stolen credit cards. Either way, it is fraud and even if you managed to sell them on ebay, Micro soft will ban the accounts soon after you logged them onto your xbox. Hence why you get the '24 hour usage' note from most sellers.
Micro shaft will also ban the entire console from accessing xbox live at some point, so it is best to find another product.
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