I think part of the equation is that none of them as yet include a service manual "in the box."
This is what I was responding to:
Why not just include the rebuild kits and service instruction manual in the box with the regulator (or at least online), one free set of kits? And then as an optional accessories sell the first and second stage tool kit?
Yes, it would be awesome if we could easily buy service kits and access service instructions.
And yes, protecting their dealers' revenue streams is probably one of the reasons we can't. But, I still think that, in the U.S., fear of being sued is part of the reason regs don't come with kits and instructions in the box.
In the end, I am really not that bothered by it, though. Mainly because, after I went through ScubaPro Level 1 and 2 Reg Tech class, I felt well prepared to work on my regs. But, I never have because:
One, I didn't/don't have all the special tools that are very helpful and didn't really want to spend that much money for what would be needed.
And, two, I knew that if I did my own, I still wouldn't do them more often than probably every 3 years at most. And that led me to decide that I don't want my regs to be serviced by someone who only ever services regs once every 3 years (or even less often). When they need to be serviced, I'd rather pay someone who is competent, experienced, and does it all the time.
So, the fact that I cannot easily buy my own kits for my SP regs doesn't really bother me much.