How in the world do you think Nokia have sold over 100 000 000 phones every quarter if the major portion of that would not come from the low end?
Nokia has been selling low-end phones a decade if not more and getting it´s major income from it, do you think they just forget it and focus only on high-end, see how well that went with Symbian and burning platform...

Same with graphics card manufacturers, the main income comes from middle to low-end cards, not the high end. The reason is volume.

The non-advertisement plan might have worked with N9 but sure in h*ll it works with the low-end.