I have mixed feelings about that. In a general sense, I feel the difference between what the "One Percent" is paid and what everyone else is paid has become unhealthily exaggerated. It's affecting our society in ways I believe are fundamentally bad.
But where individuals are concerned, when they consider taking a new job, salary and benefits are an important consideration. When offered a top position--after all, Schapiro was the head of FINRA--they'll negotiate for the best deal they can get. And Schapiro got a good one.
Ironically, though, the big compensation packages FINRA offers are intended to obviate the revolving door problem you've been complaining about. The idea is that if they pay their people salaries competitive with what they'd get on Wall Street, those people will stay on, not leave after a few years.
Schapiro herself worked for FINRA and its predecessor the NASD for quite awhile. She in fact worked for regulatory agencies for her entire career until she completed her tenure as SEC chair. Before moving to the NASD, she'd been an SEC commissioner under Reagan and Clinton. So she was the kind of highly-qualified person who could command a generous compensation package when she was appointed to lead FINRA.
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