Biggest problem I see with that is that it is a regressive tax. It will hit the poor much harder than the wealthy. Try as you might to say it won't, there are some things that everyone must buy, rich or poor. The poor will wind up paying through the nose for basic necessities. And instituting a National Retail Sales Tax will cause the barter trade to explode, thereby reducing actual realized revenue, and creating (or expanding, actually) a huge underground economy.
I'm Conservative, too, and don't think the government has any right to tell me how to have my eggs or what to do with my own land. the prime function of government is to protect its citizens, not from themselves, but from foreign aggression. After that, government should exercise minimal oversight over such public functions as are necessary for the smooth and efficient operation of commerce, while not directly engaging in the operation of commerce, or interfering with its operation with excess regulation, onerous rules, or restrictive limits.