Maybe they feel they are such a big name that they do not have to advertise. Did G.M. every really advertise the corvette? Until recently, did harley-davidson have to advertise? Not that I am making the comparison between the quality of the products, I am just saying, why waste the cash when your name is brought up so much?
As a side note, does advertising really sway any of you one way or the other? I love the budweiser frogs, but I wouldnt drink bud. I love the twins on the coors light commercials, but have never tasted the beer. (mmmmmmmm.....twins.)