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Guest
Personally I don't see a problem with doing a valve rebuild every 5 years when the tank is hydroed.
This is, after all, your life support.
I rebuild my valves every other year but I put a lot of dives on my tanks each year.
As to your other points, if you have your own compressor you can do as you wish. If I have to fill a tank for you I'm am going to err on the side of being extremely conservative. Likely you won't be there when your tank has a chance to ruin my day.
How often do you have the engine, transmission, and brakes rebuilt on your car? Shouldn't the frequency of such services have something to do with failure rates and the severity of the consequences of failures? Or is it different when customers are paying you rather than you being the paying customer?