Letters for Country Readers

Upon reading &c. I discovered that
Valedictions appear without explanation,  
Though they are relatively rare,  
It's difficult to draw real conclusions.  
There is variability within the framework.
The reader may not understand  
Exactly what has been abridged.
They, being mere country folk
Never having read Jane Austen,
Common men, salt of the earth,
Honest and unconcerned  
With such things as pride and prejudice.  
Why tell them, “et cetera and so on”?
There can be no propriety  
In saying, “I am yours and others”,
Or, “I am respectfully yours and onward.”
Even though &c. indicates that the closing is
Of the "usual form," there is no one usual form.
Perhaps prolific correspondents would have little trouble  
Interpreting "Yours, &c." at the close of letters
But perhaps the one who penned it
Was growing tired and weary, or lazily decided,
I'm not going to bother writing down all the formal valedictions,  
Just imagine I had said all the appropriate things,  
Fill them in yourself as you see fit.
Just know that I cared enough to write  
That should be adequate sustainment
Though you may know little  
About the art of correspondence  
Please accept this complimentary closing
 
     Yours, &c.
 
                                   That is to say,
                                   Your most dutiful poet
                                   Your most afflicted friend
                                   Your truly loving, but careful writer
                                   Yours very respectfully
 
                                          . . . feel free to just fill in the rest yourself as you see fit.