I think it is largely a matter of volume, Not just the volume of robots sold but also of the sensors and actuators that go into them. It's also a matter of mark

I think it is largely a matter of volume, Not just the volume of robots sold but also of the sensors and actuators that go into them. It's also a matter of market, no one is really selling robots in this price range to consumers, it's all going to large manufacturing companies or to large research institutes. There are of course even lower cost robot arms, ~$100 toys, $1000 educational platforms etc. They just don't have the precision or power needed for industrial or research applications.