Darlene and RebreatherDave,
I think many of us (at least me) began to dive rebreather because of the gas needed at depth or for long dives. Why do I have to wear a large tank or more when I can do the same with a SCR/CCR? Question of money and yes as you said time to use it then.
Anyway the point is that I don't see many other reasons to go for a rebreather.
Best,
Nad