CPU Heatsink

I would think the labor cost involved would make this milled theory BS, as we are dealing with thousands of heat sinks instead of one's and two's. Here is a quote from a company that makes the machines.

For the milling of all Heatsinks - Aluminum Heat sink, Copper Heatsink, Extruded Heatsink and virtually any heat sink or thermal management device with ultra high speed – DATRON High-Speed CNC Machining Centers are the ideal choice. Modifying or customizing extruded heatsinks is easy with our probing capability where small sections of heatsink fins can be milled away making a custom heatsink for placement in electronics and electrical devices.

Being there is another step or two involved in the process then their price should be higher than the extruded. Here extruded is my highest price of alum.