Thats cos of the $$$$$ factor =p If only Taufik put in as much effort into his game as Lin Dan does, Taufik would be unstoppable, he's the most talented guy out there.
I assumed he was using the AT900T(aufik) edition... marketing brochures i've seen from Yonex have lin dan using 900P and taufik 900T.. /Twobeer
I've post a joking reason before the game started ......... you can see it at 2007 Tournaments here : http://www.badmintoncentral.com/forums/showpost.php?p=561110&postcount=11