I have a done the CPL/IR stuff but did not want to become an FI.
A CRI can't teach ab-initio, night, IMC or IR/CPL but can teach Multi Engine ratings, tailwheel, type conversions, complex conversions, bi annual flight with an instructor, refresher training etc.
We have lots of interesting aircraft at our place that I get to fly and a lot of based aviators who are orphaned from flying clubs so I figured I could do the tailwheel training and renewals etc. There was a lot of enthusiasm for it from our based flyers so I thought I would go for it!