A few paid survey sites do pay relatively well in cash. However, many sites hype hypothetical, best-case scenarios that can't possibly apply to each and every consumer for each and every hour of participation. In the real world, the likelihood that you'll often earn the higher of the hyped amounts is slim. Most online paid surveys simply don't pay much, and you must be invited to complete them. To be invited, you must fit targeted demographics. That alone limits your earnings right off the bat, as you can't possibly fit every demographic.
Companies, brands, and organizations from around the globe are constantly seeking the opinions of people just like you to help shape the products they develop and how they market them. They count on paid online surveys to provide them with reliable information. If you spend time online and enjoy giving your opinion, paid surveys are a great way to earn a little extra cash while helping these companies.