Basically, mankind finds joy in the fails of others. That's why MST3K got his fame: They take the worst films ever, like "Manos: The Hands of Fate" and they poke fun at it. Rifftrax was made by the same people, but focusing in popular movies. That's how the Nostalgia Critic and Linkara from "Atop the Fourth Wall" get their fame, as well as the Angry Video Game Nerd and various others.