If you are absolutely certain that getting a PhD in Philosophy is what you want to do with your life, then getting an unfunded MA is not the worst thing in the world. Sometimes a MA is essential for boosting an undergrag GPA, developing a better writing sample, and getting better letter's...which can help you get into a better school (or help you get into a PhD program, period). An MA is only 1-2 years, so the expense isn't as much as paying for a PhD (which I would absolutely not reccomend). This being said, I would only pay for an MA if you have some sort of fall back option (like, parents who will let you live with them if you run out of money). I also advise getting a job (even if its just part time) when in the Master's program. Taking out loans for living expenses on top of loans to cover tuition is NOT a good idea. When you get a PhD, chances are you will have to teach or TA at some point as part of your funding package, so working 20 hours a week and studying is not terribly dissimiliar from being in a PhD program anyway.