Tell me you don't know how advertising works without telling me.
Gutfeld! has
the most viewers in the 18-49 demo of any other late night talk show (on the three free networks), which means Gutfeld! can charge more for advertising, which makes Gutfeld! more profitable for its network (Fox News). Which, because this is a Capitalist society, means Gutfeld is the most successful (because it's the most watched) late night talk show.
Like I said, Fox News has the most young viewers of any other cable news network. It's a cable news network, not The Cartoon Channel for kids.
Fox News is the highest rated cable news network for all demographics, actually. By a long shot. Which also means their advertising rates are higher, and more profitable for its corporate ownership.