Not familar with whoreing the name out but it seems like ducati likes to be involved in the best aspects of everything. I mean their racers have to travel, wear clothes, wear sunglasses, watches, hats, shoes, racing boots, ect.
So maybe in the eyes of ducati, when they do custom or special lines with these companyies its a way of letting thier fans know that they are top of the line even when it is not motorcycles. I know lamborghini has a huge line of accessory items that I am sure lamborghini owners dont buy, but those with brand knowledge get it to have something with the charging bull shield.