I went to MA school. First, I do think it is a lot of money to put out for the pay that you will receive. Second, I think because as an MA you work "office hours" it is harder to work and go to nursing school
. As a cna, I am able to work nights, weekends, or even four hours here and there if I choose. I am also able to work PRN where I can set my own schedule! I could NEVER do that as an MA.
That being said, I think you should do whatever YOU want to. It is your life! I also went to school for diesel mechanics. Everyone gave me flak about that, but so what it is MY life. I never think that learning a new skill or education itself is a waste.
In addition to MA, I also have worked as a unit clerk and a cardiac monitor tech, both due to my MA education. Personally, I would suggest the unit clerk position. You will learn about diets, multi-tasking, procedures, and develop a skill at deciphering doctors' handwrighting. It will serve you well as an RN, and you can still work those nights and weekends. Of course, as I said, it is your choice. I wish you all the best with your decision.