I think you might be making not entirely correct correlation between ambition and amount of money one makes. Certain careers don’t pay as high as others if it’s a public sector or other non corporate jobs. It doesn’t mean a person isn’t ambitious if they don’t make certain amount. Ton of people are very successful in their field and make big difference every day and are ambitious but they choose careers that will never pay 200k. Many jobs are not fairly compensated but doesn’t mean the person is not ambitious or career orientated