Bob, on face value, most of what you do seem reasonable, these are the things that any good engineer would do for his/her client. However, the attitude behind it is what disturbs me, you seem to think that most, or all of your clients are dummies who don't know what's good for their own music, and you need to protect them from themselves...or at least protect their music from them.
If I walk into a mastering studio, and the engineer treats me this way, and decides to give me his "standard lecture"......see how fast I grab my master and slam his door!
In my opinion, a part of this attitude comes from the misguided idea (of some) that mastering is some kind of Creative endeavor or a "creative field", that the mastering engineer is an artist. Therefore when they are not being allowed to impose their ideas on your record, they are not being allowed to be artistic. More than ever these days engineers seem to be totally hung up on their titles and letting the world know how indispensable they are to the production process. Could be they're just trying to secure their place?
Mastering is a technical field, the musicians already created the art, the artistic production should be done by the time it gets to you. Unless you are also the producer and/or artist, your sole job is to manage some of the technical aspects of the production. This is not meant to belittle, or diminish the importance of the mastering engineer or his work in the production process, it is just supposed to give perspective.