In diving, we progress to deeper and more challenging dives. To do this, we make sure we use the right tool for the job. Rebreathers are just a tool to allow us to do the job in the best way possible.
The issue is whether it is the best tool. We tend to replace one set of risks with another.
We dive air because we want to enjoy the underwater world. as we progres and want to stay in that world longer, we start mixing gases to help with that task.
So we use nitrox. We offset the extended time and reduced decompression with the risks of oxygen toxicity and reduceddepth capability.
As we wan to go deeper, we use trimix. Reducing the narcosis but adding to decompression and ascent/decent rate limitations.
As we go deeper for longer, we use rebreathers. Offsetting the limited gas and gas management limitations of open circuit with the advantaged of rebreathers, but add to the risks with complexity and consequences of unpredicted failure.
Right tool for the right job. If you dont need a rebreather, dont use one. Its not worth it, its not easy and its not cheap.
The amount of people that you discribe are few and I would not presume to debate their personal choice of risk vs. picture, but what I will debate is the other 95%+ of potential buyers who like to wear the emporers new clothes.