Traffic, traffic, traffic. Everybody on the web wants traffic. Earnings from the internet depend really on the traffic. Similar like a shop owner. He wants everybody to come and visit his shop (and buy something).
On both internet and brick and mortal businesses, getting traffic could be a challenge.
It’s so hard, people want to take a shortcut, for example by using a service promising 8.000 visitors per day and over 100.000 back-links.