It sounds like a good idea but how would you get around KYC/AML laws in different countries? In Canada they're very strict so you wouldn't be able to not know who you were dealing with if you were a money exchanger.
Please, answer for one question: If you think that it's good idea, do you use bitsquare.io? How often do you trade on this exchanger? How do you estimate Bitsquare exchange by using 10-point scale?