I think most if not all advertising is not geared toward us BITOGers. I am pretty sure there is not a single person posting on here that purchased Castrol or whatever because of their ads....
Now, my wife on the other hand, or anyone with her knowledge of vehicle maintenance is a different story. If put in charge of oil, she would think, "wow, that stuff lasts longer than XX Oil, that is what I will buy". So, the general public is a different beast when it comes to oil.
We all fall into that category on something in our lives. I could care less if I eat organic or not. Tell that to someone who feels strongly about organic foods and they would think I am crazy!