>Then again, I hear the sockets we use for the BGA chips I work with cost in the thousands of dollars (because custom-desiged), so I can kind of understand that the razor-thin margins the custom PC industry works with stays with cheap old connectors.

BGA means 'ball-grid array' - meaning it's an array of solder balls, meaning that ouside of testing, it will be soldered to the board... no socket required.

Your sockets for testing are super expensive because they are taking a chip that was never meant to be socketed... and socketing it, which is pretty useful when you are testing the things.

https://en.wikipedia.org/wiki/Ball_grid_array