If I’m satisfied enough with the money I’m getting for the position I’m working that I’m not looking to leave, how is that not just “paid?” Flipping it around,

If I’m satisfied enough with the money I’m getting for the position I’m working that I’m not looking to leave, how is that not just “paid?” Flipping it around, if the company isn’t ready to fire me for underperforming, does that make underworked?