I did the fellowship. Not for monetary reasons. It makes you more valuable to academic EM departments (as do essentially all fellowship programs), but it doesn’t necessarily make you create more revenue - therefore you won’t get paid more. It technically doubles your job opportunities as you can be an EP or intensivist, but you’d have to give up one. If you want to practice both, it makes it much, much harder to find a job - you need a place big enough to be able to move around faculty to give you a 1/2 FTE EM job and 1/2 FTE ICU job.
That being said, I think if I wanted to do purely academic EM, having the CCM fellowship would likely open most doors. It’s certainly the most rigorous fellowship off of EM, adds a lot to what you can teach residents (or at least gives you the credibility) and is viewed very positively.