According to this link https://www.datacenterdynamics.com/en/news/cray-1-supercomputer-amongst-collection-of-microsoft-co-founder-paul-allens-to-be-auctioned-of

According to this link https://www.datacenterdynamics.com/en/news/cray-1-supercomputer-amongst-collection-of-microsoft-co-founder-paul-allens-to-be-auctioned-off/ https://www.datacenterdynamics.com/en/news/cray-1-supercompu... these things retailed for $8 million (in 1975 dollars!). That's almost $50,000,000 today - I can't even imagine how much work went into justifying a purchase like that.