I was searching the internet for free product samples and you would not believe how much free stuff there is. Many companies will give you free samples in hopes that you will like the free Products and buy them in the future. It is a great advertising ploy.
Products like acne treatment samples are a good example. If you give a small freebie of product sample away and it works better than what they are using now that person will most likely buy your product in the future. It is much cheaper to give freebies products samples then spending big money on a internet advertising.