Just take the simple example of www.screensavers.com which is one of the advertiser from the thousands of CJ.com advertisers. Screensavers.com has millions of free screensavers on its website. Now it says you promote us and we pay you. If you promote screensavers.com and if your friend, your relative or any person from any part of the world downloads one free screensaver, you get upto Rs. 40/- per screensaver.  All the screensavers are absolutely free to download. If 20 people download free screensaver, you will get upto 20 * 40 = Rs. 800/- per day.

It means you can earn Rs. 800*30 = Rs. 24,000/- and more per month from a single website of CJ. There are number of best websites in CJ you can work with. So you can think of the earning potential.