I’m sorry, but no.
I think that you are are thinking of masters degrees, not doctoral degrees.
As I have written before, a PhD is not three or four more years of classes that somebody has to pass. A PhD is a research degree.
For a PhD, a candidate is required to produce something which is not only original, but is considered as adding something substantive to the field. It is not simple, it’s not easy, and it’s a huge amount of work.
It’s tens of thousands of hours of research, which includes thousands upon thousands of hours of data collection, thousands of hours of analysis, and thousands of hours of writing and rewriting. It requires the ability to conceive the idea, to figure out how to collect data, figure out the analysis methods, and then to understand the result. Finally, it requires the ability to put these together in a way that other will be able to understand.
Moreover, there is not single reputable PhD program which will accept a student who has not already demonstrated an affinity for research. No such program will accept a student who has not actually engaged in research activity, no matter what their undergrad GPA happens to be.
Students do not pay to attend a PhD program, the program pays them. Advising is time consuming as well. An applicant has to be good enough that the program would be willing to put the time, effort, and money into helping the applicant get their PhD.
Perhaps there are some students who apply to PhD programs because they cannot find a job, and perhaps some re even accepted to a PhD program. However, these will almost never actually complete a PhD, and so will not be part of the count of “number of produced doctorates” which is the topic of the thread.
I’m pretty sure that a PhD in Criminal Justice from SHSU will do a lot in helping somebody get a job which requires a PhD in Criminal Justice, especially if that job is in Texas. So it definitely improves their marketability for jobs that require a PhD in Forensic Science, or for which such a degree is preferred.
The market for people with PhDs, like the process by which a person earns their PhD, is not really comparable to any other type of job-training or job market. So one cannot simply extrapolate from the training and the job markets for other careers, including that of MDs.