The actual labor of unboxing consumer parts and putting them together would double the cost of the machine after you run sufficient testing on the system akin to what a factory will put it through.
Even if you got someone to sit around and just screw together PC parts, you are looking at an hour a machine (if you want to verify it posts, then stick it in a corner running prime95 and memtest to make sure the parts check out) and that is prohibitively more expensive than a Windows license.
The actual labor of unboxing consumer parts and putting them together would double the cost of the machine after you run sufficient testing on the system akin to what a factory will put it through.
Even if you got someone to sit around and just screw together PC parts, you are looking at an hour a machine (if you want to verify it posts, then stick it in a corner running prime95 and memtest to make sure the parts check out) and that is prohibitively more expensive than a Windows license.