L.W.
In addition to the good advice you have already received regarding considering things like the social network that working provides and how difficult it would be for you to re-enter the workforce later on, I would consider things like whether you carry health benefits for yourself or your family through your employer, whether you have a retirement plan through your employer, etc. If your employer is providing your health insurance and matching 401(k) contributions, for example, then the actual cost of quitting will be more than $200 a month. You need to factor that stuff into your analysis.
That said, if you are really only bringing home $200 a month from a full-time job, that doesn't seem very worth it to me financially (keeping in mind that for many people working provides benefits other than just financial ones). If you don't need the $200 and you don't want to continue working for other reasons, then quit. If money is tight, maybe you could find a different full-time position that would allow you to net more than $200 a month. Or make up for the lost $200 with a part-time, at-home job.