I think the real question here is the risk worth the reward.. Say you could flip 1000 miles a montht his way - big whoop if it has an impact on your credit down the road. I'm all for schemeing miles, but I don't think that the payout from doing this is worth the time and energy let alone the risk of getting red flagged and making life harder for yourself for a few thousand FF miles.
peace,
~Ben~