And even without the degree, he'd have to have been following money trails all his life. He'd be hugely limited in their cases if he just threw up his hands when it came to finances.
In fact, I remember a scene in Robin that took place during their year abroad where Dick was teaching Tim about how to use money to get what you wanted, how it wasn't enough to have it, you had to know how to use it. Not the same thing as what Lucius is talking about, but yeah, he's definitely been a student of money and its uses by the wealthy most of his life.