I think it's because the cost is about double of the ones that does chase last bit of performance, at same price point, I totally agree other factor is more important, but at a much higher price, maybe we want both.
Why? You can't possibly hear the difference.
They could do that, but it would probably increase the prices of their products further, as they would need more manpower and therefore cost to create actual value add for their (other) customers. Value add in their current products that for the most part doesn't quite exist with their competitors.