Arbitrary numbers I pulled out of my ass to make a point.  But, what does it matter?  Why does the actual cost of the saved components have to actually be $300?  They're valued at whatever BITMAIN decides to value them at and the rest of us just have to deal. Aluminum heatsinks aren't cheap, nor is shipping a huge chunk of metal across the globe in 2-3 days.

Edit: Aside from that you (BITMAIN) save on the fan + grill, antenna lead, control board, ribbon cables, end brackets, assembly labour, packaging material, hardware, HSC, etc.