Some people feel skin care is a speculative area. According to those people, those who preach towards skin nurture with products, are the ones earning from it.
My opinion is that people, by nature, are doubtful. Especially in todays world, where advertising agencies try to force unnecessary products down your throat. This is not how it is with skin care products. Skin care products are vital to one's good health - please, bear in mind, the skin is indeed the largest organ in the human body.
It is indeed not a "must" to be using products, as you can use natural items, but the products contain the same essential ingredients but they are built for perfection under optimal conditions. Most of us hardly have the privilege of spending much time over their skin's health, so it is quite beneficial for us to rely on optimized products with clear indsructions, and save precious time.
What is absoultely necessary for you to stay away from frauds is to fully understand what is the usage of the product you are about to buy, and how does it improve a functionallity of the body. A good product will assist a natural process of the body, like exfoliation of the skin (that occurs on a natural basis anyhow).