A survey is usually conducted by a marketing agency (or a marketing company). It uses the information to collect information that it can use to market its product and make money. So, it makes sense to get paid for sharing such information.
Today, marketeers have also realised this and hence they are willing to pay for valuable information. So, it has become a race between consumer and companies as to who spends more and make more return.
If you too want to get back some money that you spend extra on those 'Brands' who 'understand' 'you' and "your needs" so well, then explore this blog for participating in some wonderful surveys, and sharing what you like and dislike and what you want and do not.