Well, it's depend on what services, products or what content your website all about. Most of the content of websites and blog are about making money on the net.

Because of this economic slow down people was fired into their jobs. Some people need extra income for additional savings due to high price...

Other content selling products and some are services. If you sale more, you can make more money. If you offer more services, you can make more money.

But how can you do that if your website has no traffic? So the solution is traffic exchange which provide you more visitors that maybe interested into your products and buy them. To make sales is to make money.