In a nutshell your paid to watch advertisements. The concept has many flaws because you can just not watch the advertisements and keep the screen open for the nesecary amount of time, or walk away from the computer. Some autosurfs require initial investments others don't. Some sites offer credits so you can eventually run your own ad, some simply pay you, and some are scams that require intitial investment.
Karma/rep is always appreciated
There are only 10 kinds of people in this world. Those who can read binary, and those who can't.