I think that @doctormike was saying you only have a financial ROI on a CCR when diving helium, i.e. it will only save you enough money to pay for itself. Sounded like he was also implying that there are other reasons that it would make sense to use them, just not financial sense.
Yes. I got that.
I didn't add this, but let me say that a funeral costs roughly $15k-18k assuming you already have a burial plot. In dives where it may make sense from a safety standpoint, there's also an economic incentive too.