The problem with this thinking, the more technical artist will take a given content and modify it to improve it's original texture through the material room.  Thus you see a mediocre object with an impressive overcoat, you buy it, then find out that the artist had freshly given it a new coat of paint, so to speak. 

But I do agree, promos have become too specialized, WYSIWYG but only when rendered with such and such lights and such and such app.