Can you elaborate on what you mean by "there are several Ph.D. programs that do allow you to fast-track your program if you have an M.A."? Do you mean that some Ph.D. programs are open to accepting transfer credits so students entering with an M.A. do not need the same amount of time to finish as someone entering with just a B.A.?
Some Ph.D. programs seem very open to accepting M.A. credits (or at least approach it on a case-by-case basis) while others make the student start from square one (which, I think, is not ideal, especially if one has to take multiple courses over again).