I didn't say margins don't matter. I said that isn't the primary concern right now. Making money isn't simply about looking at margins and going to sleep happy.
They need market share. That is long-term thinking. See the part of your statement that I bolded? That is exactly what I said. I never said they don't matter. Go back and read.
margins is narrow, short term thinking, which nVidia both has the luxury to rest on right now, but is also sitting on the precipice of failing because of such short-sided thinking. They have already lost the technology generation for the next 3 years with their current architecture because AMD wins with DX12 and remains competitive in the part of the market that matters for DX11 (mainstream, 1080p).