Yes, you are definitely correct.
They go out. Problems happen. I will say though, having an actual machine and having it break, you learn so much from it.
Before my monitor started giving me problems, I knew nothing about multimeters, soldering, cold solder joints, schematics, any of it.
I am still no expert, but I will suggest getting a real one because if a problem comes up, yes it will suck, but learning how to fix it yourself, you will learn alot. I am no expert, I am a self proclaimed newbie with arcades, but I have learned enough already to make me doing it myself all worth it.
My personal suggestion would be to do what I did, get a cheap cab for 100-300, get it jamma compatible, and get some jamma boards. If you get a problem, learn how to do it. Sure I am asking dudes here on DP for every single step in the process, but I am fine with that (and from their help, they seem to be fine with it as well).