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I wasn't aware Mt. Gox retained the right to pick and choose which Bitcoins they'll accept. Where can I find their policy on this? What happens if I transfer them coins they choose not to accept? How can Bitcoins remain useful as a currency if people start picking and choosing which coins they'll accept? This increases everyone's risk when accepting Bitcoins to intolerable levels.
Yep as I mentioned a few pages back
https://bitcointalk.org/index.php?topic=66916.msg777985#msg777985