ROL - you make some good points and although I didn't go into this, part of the "cost / commerce" decision is the total scope of the event. If mounting a show in the city library with 20 - 30 prints to frame, I could make a different decision than when framing one image for a competition in a more upscale venue. But you are right that the presentation is a part of the image's final form and will, or can affect the viewer.