"Bank exec blew a whistle his company and got 3 years in minimum security prison. By coincidence he also got a lot of money afterwards."
Basically unless the whole story the whistleblower reported was fabricated, I don't think there's any situation where I'd be ok with the whistleblower being the only one jailed. As part of a larger group - sure, maybe.
Otherwise what's the point of whistleblowing? It would only work if you hate the company more than you like your current life. Or if you knew how to do it anonymously.