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Guest
I resemble that remark and just don't see the sense in taking any chances.
It's worth the $ to me having that feeling that at least I have done everthing to mitigate possible problems.
There is really nothing wrong with that if you are unwilling or unable to put more effort into DIY. But you do need to understand that mfgr recommendations are very much safe sided (or they are just trying to support their retailers). You also need to understand that each time you have a regulator serviced is an opportunity for a maintenance error, some of which can be quite serious.
It is not a problem until you try to tell others who are willing and able to put in the extra effort to make sure their regs are in good shape through testing and inspection that they are taking unnecessary risks.