My gf works at BMO and her full time salary as Teller was $30,000 / yr. She just got promoted to FSM1, and only makes $33,000.
After you factor in taxes and deductions, you don't really end up making much. And moving up the ladder takes a lot of hard work and patience. You get yelled at by dumbass customers who don't understand the concept of banks and fees, every single day, and your branch manager will rarely side with their colleagues, since priority is on customer service.
You gotta kiss a lotta ass in the banking business.
Just my POV.