It's entirely possible. A lot of experts on this forum make enough money to live like kings (but they'll never give away their secrets... Your best bet is to come up with your own methods once you learn the basics and how everything works)
You can make even more than a regular full-time job, because there is no arbitrary limit on how much you can make. That's what I don't like about regular jobs: no matter how hard you work or how many great ideas for improvement you come up with, some jackass in the payroll department has decided that you don't deserve any more money, EVER. Making money in IM is hard at first. It might seem hopeless. But once you break in and start earning, you are only limited by your own ingenuity and work ethic.
Take control of your destiny! Work hard, work smart, and make yourself a millionaire!