The jobs for PMHNPs abound, and the salaries are quite high. You should expect between 90 and 180, as a starting salary, depending on your area of the country. I wish all NP programs were sort of generalist/FNP in nature with other specialization in a given specialty, i.e. psych, peds, gyn, etc. Unfortunately, NPs are required to be certified in their area of specialty and to pick up another specialty they must take the extra courses and testing for an added certification. The PA curriculum is a much better midlevel/extender curriculum. The FNP is often the choice for many because the student thinks they'll be able to anything, and they won't. This is especially true of psych. In my region, there are some FNPs who jumped into psychiatry early on and still earn less because they are not paneled to see all levels of mental health. They can, however, refill a patient's cyclobenzaprine without question, lol. None of the FNPs I know, in outpatient psych, are allowed to see those suspicioned as being psychotic, bipolar, or ADHD to name a few.
ETA: I'm not sure how I stumbled upon this thread as it's rather old. Forgive me.