Just… wow. It was sort of a given that Nike’s limited edition, McFly-inspired Air Mag sneakers would be fetching pretty pennies on eBay, but TMZreports British rap act Tinie Tempah spent more than he thought he would on the first pair up for grabs. The cost of his impulse decision: a cool $37,500.Mr. Tempah, a reputed Back To The Future nut and sneaker geek, received the sneakers and a nifty “plutonium” carrying case for his trouble.