If for some reason you thought Best Buy Buy Back – a trade-in program in which you pay Best Buy up front for the guarantee that they’ll buy back your gear for a pittance down the line – was a profitable way to get rid of your old gadgets, let Digital Trends disabuse you. They ran the numbers and found that you’re potentially losing hundreds by selling your gadgets to the retailers instead of flipping them online. [DigitalTrends]