The bolded part definitely isn't always true. And they're certainly not maintained by people who care more than you do. Most dive shop regs are cheap regs treated just well enough to keep them kinda working....and when they stop working they're patched into working. Dive shops don't typically make loads of money, so they don't spend loads on keeping everything perfect and pristine. Plus, cracking open my first "vomited-in" second stage sold me on buying my own. Regs might be more expensive down under, but in the US they pay for themselves pretty quickly. What dive websites do you have access to and what shops are close to you (so we can pick out good reg sets to recommend).....and how much do reg rentals run?
(bold added by me)
I'm not a regulator tech but I have rebuilt my regulators on several occasions and I can tell you something.
First of all, most dive shop regs -- at least in our local area -- are NOT cheap regs (most are mid-range regs from the big-5 - Aqualung, apeks, mares, Sherwood and Scubapro) and not not badly maintained.
Dive shops here are required to keep records of maintenance (based on serial number) of every regulator they have in the rental stock and to fully maintain them every .... I believe ... 6 months. Shops here have a maintenance regime and the guys who rebuild these regs do maybe 6 or 8 dozen rebuilds a year. Nobody touches one of the rental regs (even if they think they know what they are doing) if they are not certified. I am one who is not certified. If I notice a problem with a reg I put a "tag" on it and on the tag I write down the date, my initials and the issue I noticed and it goes straight into maintenance. Any abnormality mean the reg is taken out of circulation and sent straight to maintenance.
My friend, the one I dive with most of the time, is one of these regulator techs. He isn't "throwing in a parts kit", which is the criticism you see a lot on the internet and I don't think you can call him out for "not caring". He's told me that if he wouldn't give it to his best friend (which is me) to use that he won't put it back in rental. Others are slightly less picky but the rules seem to work since I don't know of any shop in the Netherlands where poor maintenance of the rental stock was the cause of a serious incident.
Moreover, and this kind of gets to the core of my point, I agree when I hear that nobody will care about your reg as much as you do..... but caring isn't enough. I've asked my buddy to watch while I rebuilt my reg on a number of occasions and usually somewhere 1/2 way he says to me, "I'm sorry.... but I have to take over." Caring.... even a LOT... doesn't automatically make you competent! My friend as rebuilt thousands of regs of the same type I use and I've rebuilt.... 6 or 8.
I'm not saying you shouldn't try it.... but the justification I keep hearing on the internet about how only YOU can be trusted to rebuild your regs even though the tech at the shop may have done thousands...... Meh.... I think that's just a rationalization..... it's an excuse for not wanting to delegate or not wanting to pay for it.
In any case I've stopped maintaining my own regs aside from minor stuff. I asked my friend for a list of people he would recommend and 9 times out of 10 I wait until I know he's on the roster and I'll put them in then.
R..