Well, I'm an FNP and I work in a rural health clinic close to the town I live in. I make a base salary in the mid 70s with a productivity bonus structure.
Basically, I provide primary care to all age groups. I don't have hospital privileges, though I could apply for them if I wanted them, I don't take call because I'm a new NP (graduated in Dec and they require 2 yrs experience before call is expected), I work M-F 8-5 and I am expected to build my own patient base.
Now, if you want to do NICU work, why not do Neonatal NP or Peds NP?
It depends on BON rules for your state about whether you can work "below you license" and also, some hospital rules as well. I know in Ohio, the board does not forbid an RN from doing CNA work or an NP from doing RN work, but they state that you WILL be held responsible at the fullest extent of you license.
So, if something happens and it goes to court the judgment can be based on what a prudent NP would have done vs. what a prudent RN would have done. This could get you in trouble because even though you don't have the authority within the hospital to act as an NP, you are expected to think like an NP. Trust me RN and NP thinking are two entirely different things.
Yes, some places won't want to hire NPs as RNs because that puts the hospital at risk as well.