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.
There are myriad ways in which individuals can make a little extra cash each week, but few compare to the speed, ease and consistency of paid online surveys. Making money online should always be a spare-time type of activity, and surveys might be the only ones which fulfill this requirement time and time again - no matter how long an individual chooses to participate in these programs - while the opportunities to have a little extra cash in your pocket should be savory.