I have. And yes, Maggin did see Luthor moving into business as he got older, but he also envisioned that as part of the life of a reformed Lex. His Lex also already was a billionaire, with his wealth hidden in false identities. Maggin's Luthor didn't care about money except as a tool to defeat Superman.
I also really believe in my earlier statement, that if life is a highway, then Lex is driving a Maserati but is stuck in traffic with a bunch of tricycles. The stupidity of people (compared to him) just pisses Lex off. And then, while he's stuck in traffic with all these tricycles, he looks up and who is flying overhead? You guessed it.