There are various benefits if the order is made as a Qoo10 member such as Qpoint, Qstamps and Qoo10 member can join in a variety of events provided by Qoo10.
(For more info on Qpoint, Qstamp, coupons, please refer other FAQ on "Account" category.)
And as for the registered member, it is possible to trace back the QooID or reset the password when you forget the Qoo10 ID or password.