Cost means energy use in addition to hardware, so it should matter to climate concerned folks, not just investors.
Also these reasoning models are way less likely to hallucinate given time to think (test time compute). Think applications where it matters like augmenting or replacing existing labor, which will start to happen more.
The paper details more about how they got these things to train each other, so in theory you'd train these tiny 1.5b or small 8b models to specific tasks.