I believe that in real terms all new underwater housings are limited production models.
The days of cast or molded aluminium housings are gone - modern manufacturing techniques , rapid prototyping and multi axis / tool CNC machinery have made low volume machining a more viable option for manufacturers of niche products such as underwater housings.
The ability to tailor an actual production run to real market demands rather than anticipated is not to be undervalued and in the longer term will only benefit the underwater imaging community.
Better to lose a few R&D dollars ( or Euros / Yen ) than have significant capital investment in a pile of castings that have no demand.
My 2 cents - now back to the workshop to bolt together an even lower volume item - a 160 CI V-TWIN for the old bike 