Jyn, please choose your options carefully before you invest your valuable time to get a "PhD" in anything (i.e: 1) lawyering, 2) doctoring, 3) Wall-Street-gambling, 4) casino-gambling, etc...).
Options:
1) Lawyer
A good counselor usually makes about 400,000 bucks annually. The best probably makes a hell lot more.
2) Doctor
MD with good practice makes an average of $500,000 a year. The best probably makes a hell lot more.
3) Day-trader
A decent Wall-Street gambler makes around $80,000 a year. The best ("with connections") probably makes a hell lot more.
4) BJ Gambler aka BJ-AP
Never mind how much an AP makes. The best AP quits, and that tells you a lot! i.e., Arnold quits BJ & goes for poker, Edward Thorp quits BJ & goes for Wall Street gambling,