There are several ways someone with purported influence in politics can benefit. Take the Clinton Foundation for example, I think it's entirely legal, and maybe at times it does some good, somewhere, maybe, but it's a way for corporations to "funnel" money to an interest of the Clintons in hopes she would become President and they would have a voice. It also hired a lot of folks to "work" for the CF when she was not running, and then they became part of her campaign staff, she had an army in waiting, being paid.
Of course, any charity can run this kind of scam, hiring some VP who is a daughter of someone in politics, and paying her a huge salary.
The book gambit is one of the easiest of course and most widely used. Often the books are barely written by the principal.