You should enter and complete a full MBA program if you can answer yes to ALL of these questions:
1) You have no possibility of earning income during the next two years.
2) You are accepted to, and committed to, a top-ranked program.
3) Completion of the program will guarantee an immediate increase in salary, prestige, and upward mobility.
4) Your age is under 26.
The value of an MBA has continually slid since the early 1970s. If you are an accountant, and think you can use an MBA to move into the investment world with requisite financial management skills, then you might consider it.
Many better options exist. Consider them first.