The big brands should not ignore this thing at all.
But also they could spend more time on advertisement over understanding the audiences because they are on the market many years.
The buyers know who they are, know what are they selling, know that the products are good.
I think the advertising should take bigger place here because if the companies ask everyone what they want, they could end up making many different products with not much people to buy them. Some of the people doesn't even know what should the product be like or what color or look or whatever. They are satisfied with the knowing that the brand they are buying is very well known and delivers quality.
For example CocaCola spends more from the income on advertisements, why? They are well known, they are selling drinks all over the world, but still are advertising like mad. And did some very nice ads made you want to get up and buy the product (not just cocacola)? Because one good innovative ad can make you want to buy the product no matter how expensive. These ads exist. Keep on advertising and you will keep on selling.
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