Actually, advertising influence really depends on the person's individual beliefs, their personal choices, and their habits.
I took a marketing class in college, and I am familiar with this. Like, say, you want a girl to like you. Of course you'll buy Axe deodorant, because those ads are full of women throwing themselves at guys.
Does it actually work? Well, I wear Axe, and, no it really doesn't. But it does make you sort of believe that it will, which puts it in your head that you should get it. It's a clever marketing scheme.
When you see Justin Bieber, do you think girls actually like him because of his musical talent? Nope! If they were into musical talent, they'd be digging The Rolling Stones, or Led Zeppelin, or Michael Jackson. Of course, they dig him because he has an image, he's good looking, and therefore they can dream about having his babies.
Another example. Starbucks. Is Starbucks really the best coffeehouse out there? Nope, of course not. I can name at least three coffee places that are better. But since they decorated their logo with a cup of coffee, they have a good reputation, and they're pretty much the McDonalds of Coffeehouses...they get customers.
Without interest, there are no customers. And without any customers, a place will steadily go bankrupt. Especially in this economy!