Advertisers love affiliate marketing because it involves minimal risk. If a sufficient margin is built in as compensation for the affiliate, it becomes impossible to lose money. That’s because affiliates are generally only paid when a sale is completed (i.e., a lead is converted). Advertisers (or “merchants”) pay nothing for leads that don’t convert.
Many voucher code web sites use a click-to-reveal format, which requires the web site user to click to reveal the voucher code. The action of clicking places the cookie on the website visitor's computer. In the United Kingdom, the IAB Affiliate Council under chair Matt Bailey announced regulations that stated that "Affiliates must not use a mechanism whereby users are encouraged to click to interact with content where it is unclear or confusing what the outcome will be."
For sites looking to monetize their existing traffic through affiliate marketing, a major determinant of success is picking the right offers to run. The difference in earnings from a bad offer and a good one can be enormous. Unfortunately, finding the “right” offer isn’t exactly easy; if you’re using an affiliate marketing network such as Commission Junction (now part of Conversant), SharesASale, or LinkShare, you will have literally thousands of affiliate offers available to you.