I think they may have used a black, dark skinned model for contrast, since the suit is such a light color.
Also, if you think black people aren't buying these, wouldn't it make more sense to advertise to them? Gotta get more new customers, not just pander to people who already purchase your stuff.
For the record, I don't think this suit would look good on you if you have very pale skin and the color would blend in with you. Go for a darker color.
Though, as others in this thread have pointed out, the style is ugly af regardless of color.