Your Instrument Instructor Rating (CFII) will allow you to teach other helicopter pilots to fly by reference to instruments, making you more employable as both an instructor and pilot (see below). 

Helicopter Instrument Instructor (CFII) Rating Requirements 

Must Hold a Helicopter Instrument Rating
Must Complete the FAA's Helicopter Instrument Instructor Written "Knowledge Test"
Must Complete Instrument Flight Training in a Helicopter Prior to the CFII Checkride
Must Pass an FAA CFII Instrument Oral and Practical Flight Test (Checkride)