There have been other threads about this before.
The MFA is not a make or break in this business, but it's really about are your marketable in the market you want to be.
You are a business of one person, and you need to be as prepared to enter this workforce and compete with everyone else in the marketplace for jobs. If you feel you can do that without further education, then go for it. Why waste the time and the money? There are positions out there, mostly attached to the education facilities, where it will be tremendously easier for you to work if you have the MFA.
If you have any specific questions, show me an IM. I am a grad school graduate, and I can go on and on about the pros and cons, but it comes down to a personal choice.