Keep in mind the Berkely USB converter has clocking circtutry (and powersupply of course). When you feed USB to the MSB dac this is entirely redundant. So of course $1400 for a USB interface is a rip off in terms of cost of components to price ratio, but you are really paying for the functionality (another gateway into the architecture of the MSB processing engine) more than components. an analogy is when you buy a software package you pay a license fee to switch features on and off. In this case, the cost to the manufacturer is not even the $50K - it is zero.