no you do not. And yes, i have listened, jsut to be open minded.
Note the argument is stringer than some data above would suggest. For the most part it does nto matter if the jitter is the same or not between costly and cheap-o hubs, because THAT JITTER DOES NOT APPEAR AT THE DAC CHIP ITSELF. In fact, on USB interfaces, the bits are read in essentially asynchronusly into a buffer. All timing is basically lost. They are then, at least in really good DACs, clocked out as precisely as possible. This costs. QED.
Now a good network with good throughput will minimize buffer underruns, and will allow the highest bit depth, over/up sampling etc.
So yes, networks matter but not int he respect these high end units suggest.
Oh, and they dont sound better. Many things do, not those.