That's the point we've been talking about. It isn't cheap or good price performance.
Most people settle for decent performance, not the ultimate speeds. Most people don't want giant cooling towers and kilowatt sucking power supplies.
The Zhaoxin KX-6000 has the necessary decent performance, which should improve when SMIC gets its N+2 process going.
As for price, that will come down when volumes go up; economies of scale will make the chips drastically cheaper.
The major point of the KX-6000 is that it works, and it's a great insurance policy for China to have if the crazies in the US (or the Taiwanese pineapple heads) think a total chip embargo would kill the Middle Kingdom.