When Lex first encountered the system he had been nothing more than a depressed, ill programmer with a bit of money on his hands, and a tumor affecting his thoughts. Sure, his family was secretly a big shot and he had inscriptions on him and maybe if he was on the verge of death his family might have found a way to save him or something.
That didn't matter. Mentally, he was a depressed man in his twenties with no direction and no desire. It literally took the fear of death to elicit some emotion from him, not to mention the novelty of the system itself.
Now, countless years later, he was so much more. He was Lex Williams, since for now he had decided not to change his name. But he was also someone who regularly made the impossible happen. In fact, he not only made it happen, his brain now worked in a way where he just thought of ways to make impossible things happen.