Earlier quoted context omitted.
What's the deal with these prices? Is it just because the connector is so compact? A 2-meter QSFP+ 40-gigabit copper cable is only about $25. https://www.fs.com/c/40g-qsfp-dac-1117
They are "active" cables and so have microcontrollers in them.
Is it that the Ethernet people have moved the costs into the port and their ports cost more, while the thunderbolt ports cost less and the cables cost more?