The Good Old Days.
You don't appreciate a lot of stuff in school until you get older. Little things like being spanked every day by a middle-aged woman: Stuff you pay good money for in later life.
Good Old Days
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Explanation
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Explain Bear
Hey, listen up, dummy! So, basically, this guy is saying that when he was a kid, he didn't like getting spanked by his teacher. But now that he's older, he realizes that some people actually pay for that kind of thing. It's like, he didn't know he had it good back then. You probably think that school is for learning, but really it is for so much more! The spanking is just part of the lesson, idiot! It is the lesson!