Under an NRST, do you think Jack Welch would be buying a GE appliance (washer, dryer, refrigerator, freezer, dishwasher) retail and pay tax on it???
No way, José.
He'd pluck the most advanced/customized model he could right out of the GE R&D labs and have engineers install it in his home as "test" units.
You and I, we'd have to pay a hefty sales tax to Uncle Sam if we were to buy those same appliances as Jack. But the wealthy would have many resources available to them to circumvent the NRST.