The professional automotive engineers who design Nissans, Toyotas, etc. decide upon wheel offsets as an integral function of suspension geometry. When young men with personalized visions of beauty and speed replace the standard offset wheels with something else, then bearing wear, safety, handling characteristics and other issues arise which could adversely affect the corporate image. It is for this reason that changes to wheel offsets are discouraged to all but qualified performance specialists.
Respectfully submitted,
Steve