I suppose there is something to be said about a good education. If you are happy with your school and the instructors and okay with spending that kind of money, far beit from anyone here to tell you not to do it. You, and you alone, can be the only one to make the right decision for yourself.
As for paying more for good quality higher education, I agree with the premise wholeheartedly. But we are not necessarily talking about something that will be a career for you, or maybe we are? For myself, I would have a problem spending $1000 for "the opportunity to train" for a blackbelt because my extracirricular activities are exactly those, extras in my life to keep me happy and healthy and content.
If your plans for the future are to open up and run a successful TKD school and you think that this is necessary for you to be able to attain that goal, then by all means do what you need to.
Just remember to keep training no matter what your decision is