One of the things that I'm confident is hurting the steel cylinder market for Scuba is the secondary market for these things.
I have purchased over 20 steel cylinders in the last 6 years, and only two have I purchased new from a dive shop (you guessed it - the first two.) Some I've kept personally, some I've purchased and re-sold to friends, many I've flipped for a profit. The secondary market for steel cylinders is very, very strong. It remain strong because of four factors:
1) Diver turnover is high - new divers leaving the sport and selling off, older divers going into gardening and golf
2) Demand for used galv steel cylinders is high. Try to find a used HP100, or a used E8-130 in the major dive markets (California, Florida) and you know what I mean. When one becomes available, there is a line. Demand for used steel tanks is incredibly fierce
3) They last virtually forever - a galv steel tank will last 30 years or more if cared for properly
4) Accessibility of used gear is brainless - eBay, DiveMatrix, DecoStop, ScubaBoard, Dive Clubs, Craig's List and more. Used Steel tanks are easy to list, find, easy to move
If the NEW market for steel cylinders is, as Phil mentioned, only 10,000 per year, surely the number of used tanks changing hands is many, many times that.
That does not make a good marketplace for any manufacturer to enter. A soft primary market and a robust secondary market is bad news for a manufacturer, as they get no love from the latter.
The thing is this: these tanks hold their price. I'm always amazed at how well steel tanks hold their price. Most of my PST 130's I paid between $250 and $275 for. I've passed on dozens of them and watched them sell for $300+. This SHOULD be good news for a manufacturer, as a small discount on a new tank is likely all that's required to move buyers from this secondary market back to their primary market.
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Ken