1. Declining viewership: Fear Factor's ratings had been steadily declining for several seasons. By the time the show was canceled in 2006, it was averaging only about 5 million viewers per episode, down from a high of 18 million viewers in 2002.
2. Controversy and criticism: Fear Factor was known for its extreme and often dangerous stunts, which drew criticism from some viewers and watchdog groups. The show was also accused of being exploitative and of taking advantage of its contestants.
3. Changing tastes in reality TV: By the mid-2000s, viewers were becoming increasingly interested in reality shows that focused on social interaction and drama, rather than extreme stunts. Shows like Survivor, The Amazing Race, and Big Brother were gaining in popularity, while Fear Factor was losing ground.
4. Financial pressures: The cost of producing Fear Factor was significant, and the show's declining ratings meant that it was no longer profitable for NBC. In 2006, the network decided to cancel the show after six seasons.