Your understanding is wrong: there is no generic hardware. Nowadays, companies design laptops and qualify parts specifically to build Windows laptops. They follow design demands and specifications laid down by Microsoft and Intel, which is why they are all doing UEFI and many did netbooks and Ultrabooks.
Also, these are integrated packages so the idea that the OEM should take Windows back is illogical and nonsensical. It is a delusion that bears no relation to reality.
If you want a comforting thought, price is largely a function of volume, so you are getting massive benefits by riding on the back of the economies of scale created specifically by and for Windows. You are gaining far more in real cash savings than the trivial amount that you pay the OEM for its version of Windows.
In the long term, however, you should try to see this for what it is: a very pragmatic business. It's not religion.
Also, these are integrated packages so the idea that the OEM should take Windows back is illogical and nonsensical. It is a delusion that bears no relation to reality.
If you want a comforting thought, price is largely a function of volume, so you are getting massive benefits by riding on the back of the economies of scale created specifically by and for Windows. You are gaining far more in real cash savings than the trivial amount that you pay the OEM for its version of Windows.
In the long term, however, you should try to see this for what it is: a very pragmatic business. It's not religion.