A photograph on canvas has "cheaper" written all over it. If it's quality then fine paper is essential.
The buying public purchase your work because of the image content, the composition and what it says to them. Canvas, paper, acrylic, metal, it’s all the same to them or at least means very little compared to the image itself. They buy the work because they acquire an emotional connection to it and are then prepared to exchange their hard earned cash for it. It could only be a photographer who would purport to judge the aesthetic quality of another photographer’s work, based on peeping at the substrate it is mounted on, or whether it has the appropriate gallery frame or not.
So what I think you are referring to here Russ and suggesting should be a tenet chiselled into stone for us all to follow, is how you see and present your work as a photographer, but also as someone who has a predetermined mindset of what you think looks ‘cheap’ or what looks like ‘quality’, which in actual fact has nothing to do with what is actually cheap or quality. Or indeed has anything to do with how the buying public gauge what is cheap or what is quality. People buy the picture for what it is and for what it means to them, not for what it is printed on, or how it is or is not mounted and framed.
I recently visited a gallery show and the ‘artist’ told me he was also a picture framer by trade. The mounts he was using were exquisite and obviously very expensive and very much reflected in his prices. The pictures within the frames on the other hand, were no more than average (I am being kind) and so when I asked how he was doing for sales, after giving me several reasons why he wasn’t doing well, it became fairly obvious that he wasn’t selling anything. Yet he had the best of everything presentationally but hadn’t yet realised, it isn’t a beautiful hand finished walnut frame with gold leaf inlays etc that makes people want to buy your work, it is the work itself and what it means to them the moment they see it – I suppose you could compare this to a common critique of good and bad design as ‘Form over Function’, only in this case it would seem that you are arguing for ‘Presentation over Content’.
But having said all that Russ, if what you do works for you, then I sincerely wish you every success with it, but this can only ever be how
you think you should present your work, but which I would argue has nothing to do with how the buying public think they should buy it, as they don't really think about any of this, only whether they are emotionally attached to the work and what it means to them

Dave