Depends on your company. Some places require you to keep it current others do not. If you plan on moving areas or out of state you should keep it updated.
My company and county don't require it. I don't plan on moving anywhere so I did not update mine.
Depends on your state, agency, and personal plans. If you ever plan on moving or applying for reciprocity in another state - it is extremely wise to keep your NR current.
I keep mine current just because I can, and so I have more flexibility on where I can work. It is never a bad thing to have on a resume too.
Sometimes you can work your CE/recert requirements meet some or all of both your state and NR requirements.
Ohio it's not a requirement, but if I maintain it I don't have to do the CE. Because the NR allows one to test out now I essentially don't have to do CE which is nice since I don't have the time.