This article mentions that some investment bankers make as much as $20,000 a week. That is enough to make you want to consider this as a career choice. However, you should be prepared to make a lot less than that.
I think the average salary is around $100,000, and you can be almost certain that you will be making considerably less than that when you begin your career. As this article says, these finance jobs are very competitive and only the people who are willing to put in the time and work get to reach the higher end of the salary range.