Many do the IMCR to expand the use ability of their aircraft!
But do remember it is not an IR!
Can it be used like an IR YES OCAS but the guys I know who do use it that way are capable and experienced.
Often IMCR OCAS is more demanding than an IR because you are on your own often with no radar. With said rating we also get into the realms of the home made approaches and again I know a few who do that but you really do need to be experienced, comfortable on instruments and situationally aware with a lot of spare mental capacity.
As one post said getting the IMCR is like being a green PPL and it's a start to learning not a launch ticket!
Pace