The seeming ridiculousness of the price difference is another way of looking at how hyper-efficient modern mass manufacturing is.
Their original cost for that part is miniscule. BUT! That's the cost of that part, being delivered to the assembly line, in bulk quantities, at a regular, predictable order cadence from the upstream supplier, over an unchanging delivery route, with minimal inventory kept on hand. Essentially, everything they can do to reduce the cost.
None of those things are true for a replacement part you order. It's an entirely different logistics chain, with entirely different costs.
Their original cost for that part is miniscule. BUT! That's the cost of that part, being delivered to the assembly line, in bulk quantities, at a regular, predictable order cadence from the upstream supplier, over an unchanging delivery route, with minimal inventory kept on hand. Essentially, everything they can do to reduce the cost.
None of those things are true for a replacement part you order. It's an entirely different logistics chain, with entirely different costs.