The "fair tax" is anything but fair. Lets say you earn a whooping $25,000 a year and have a family. You won't have the luxury of socking away a huge chunk of money to avoid spending it and therefore paying taxes. Being generous, You have to buy $20,000 worth of stuff to support your family. Your consumption tax rate of a "modest" 10 % means you pay $2000 in taxes.
Another guy earns $3000000 but can easily afford to support his family on $500,000 with lots of luxury items thrown in. So he pays $50k in taxes and earns interest on the 2.5 million and earns a modest 5% on that money netting him another 125,000. Sure the gov't got some money, but really he comes out ahead and is not sacrificing anything. The poor guy is the one really feeling it. Not to mention the rich guy will continue to say we should get rid of medicare. In other words, the name fair tax is misleading.