It is true about salaries right now. This is why there are no takers for CC fellowship slots. You never know about the future however. There is a lot of data that show better outcomes with a closed unit. Many surgeons (hospital cash cows) are getting very comfortable with an expert (full time critical care doc in closed unit) managing their patients. If this trend catches on there may be an increased demand for SICU attendings. Just like eveything else, if there is a demand, there is cash to be made.
Don't get me wrong, I am not trying to claim that monetarily this is definitely the way to go, but who knows in the future. One of our CA-3's is doing CC fellowship next year and he threw out some obscene number like 23 slots out of 200 filled early in the game. I can't verify this beyond word of mouth, but interesting.