That hasnt been my experience. I dive mostly Atomic and I have yet to be on a liveaboard, including indo-pacific where at least one other diver wasnt also diving them. The last liveaboard I was on, four other divers (so 5 out of 14) all had Atomic Regs. While I know that isnt the norm, I dont think it shows a ``turned off'' community.
If anything, with a lot of people, the price just turns them off. There is a huge market now, especially with cheaper, intro regulators. A new diver is unlikely to drop nearly a grand into an intro reg and octo setup for a hobby they dont even know if they will like. Factor that in with most dive shops like to sell packages to new divers (90% of which never do any research) and those packages rarely if ever come with anything Atomic. That includes me. When I first started diving, I couldnt tell you a single company other than Aqua Lung and I only knew that because that is what my dad owned.
Buy the Z3, pair it with a cheaper budget octo, and call it a day. It has everything you will need for the next 10 years and will breathe equal or better than anyone else's top end setup for hundreds less.