Because the top half of the first stage gets covered in ice when they fill it with liquid oxygen and you wouldn't be able to see the logo anymore.
Quote from: nacnud on 01/03/2018 01:57 pmBecause the top half of the first stage gets covered in ice when they fill it with liquid oxygen and you wouldn't be able to see the logo anymore.And the bottom half will be covered in soot after some flights and the logo will not be visible either. Put it on the interstage!