I agree with you.
In the distant past I posted a fairly detailed description of several pre-dive checks a diver can do and a couple more using an IP gauge connected to the LP inflator hose that will do a really good job of diagnosing any looming problems with your reg. .....
Here is a link to a sticky with good info from the DA and the other Usual Suspects ..
http://www.scubaboard.com/forums/regulators/260452-regulator-checklist-inspection.html
In addition, you should also keep a written or mental log to benchmark the information so you can see if there is any degradation occurring. I'm too lazy to keep a log, but I know that all my first stage regulators pretty much have an intermediate pressure of 135psi, and all my second stages have a cracking pressure of about one inch H2O. If I see much change from there, I know it is time to investigate.
c