I support a national sales tax, but I have to disagree with you here.
You disagree because you don't understand the economics of the Fair Tax scheme.
Person A pays $25 on his earned $100 and saves it. After the NST, he spends his $100 on a widget costing $100 and pays another $25 in taxes.
After the effect of the Fair Tax kicks in, lowering manufacturing & selling costs, he spends $75 on a widget that formerly cost $100 and pays another $25 in taxes.
Given, -- lower costs do not happen overnight. Income Taxes must be abolished substantially before the sales taxes are put into effect.
Go look at my example (post 199) again. In that example, the widget formerly cost $125. Now Persons A & B are paying $100 for it plus $25 in tax. But Person A has already also paid $25 income tax on his money and Person B has not.