They are just not overcharging. Nvidia's top AI chip Rubin sells in 72-GPU racks for about $3.5–7.8M. A rack running Xiaomi's MiMo V2.6 Pro generates roughly 150–300B tokens a day, worth about $130–260k at Xiaomi's API price.
That's a payback of the infrastructure in a few weeks in theory. After a few weeks or a month, the only cost is electricity, and whatever they make after that is pure profit. This is why they can charge normal prices. Not $50 for 1M tokens.
My understanding is that these electronics need to be radiation hardened (eg; RADHARD) to prevent them from misbehaving in ways far worse than the Belgian bit flipping incident (https://radiolab.org/podcast/bit-flip). If you want to use commercial off the shelf (COTS) parts, you need to install them in triplicate and have them "vote". (https://apps.dtic.mil/sti/citations/ADA391766)
