From what I've seen, the buy-right-buy-once maxim does not really apply to scuba gear.
No matter what you purchase...eventually you'll feel compelled to upgrade/replace the gear
or experiment with a different gear configuration. That's the nature of the sport. Accept it now or accept it later.
Most people purchase a first set. A few years later, they upgrade and relegate the primary set to backup duty. A minority of folks morph into tech divers. When it comes to gear, the one kind of tech diver I know is a hoarder/packrat. I suppose there are a fair number of "wheeler-dealers" constantly selling/upgrading old gear out there as well. I know at least one tech diver who has squirreled away enough gear to open up his own dive shop.
When it comes to regs, the cost of servicing is significant. If the reg owner has to pay for his own overhaul parts, he could easily spend $75-$125 (labor + parts) on a routine reg overhaul. And this doesn't even include the cost of broken/worn parts (mouthpiece, 2nd stage diaphragm, hoses, etc.). At least with the HOG regs, there is
currently a path to DIY servicing. Not sure what the situation will be in 10-15 years, allowing for changes in the dive industry, U.S. legal climate, and the economics of overseas manufacturing. No one knows the future. If successful, the company could very well continue on as an independent manufacturer (I hope this is the case). Alternatively, it could be gobbled up by one of the larger reg manufacturers or purchased by another scuba company wanting to add "tech-oriented" gear to their consumer line.