Why do restaurants charge cake feed?

I've always wondered, why do restaurants charge for CAKE feed? Is it simply a way to make extra money, or is there a deeper reasoning behind it? It seems like a strange practice, especially when you consider that many restaurants already charge a cover charge or service fee. So, what's the real reason behind cake feed charges? And is it really necessary for diners to pay for it? Let's dive into the topic and see if we can find some answers.