I disagree with a flat sales tax for the same reason I disagree with a flat income tax. Both put a substantial burden on the poor, albeit in slightly different ways.
A flat income tax, while seeming more "fair" than a graduated one, affects the poor disproportionatly. 20% of 10,000 dollars means a lot more to someone making 10,000 dollars than 20% of 10 million does to someone making 10 million.
2,000 dollars is food for the year for someone making 10,000... 2,000,000 is just another mansion for someone making 10,000,000.
A flat sales tax affects poor people disproportionatly simply because the less money you make, the more you HAVE to spend simply to survive.
89th percentile isn't to shabby I'd say, Steve. You make more money than ~90% of the people in the country. I guess I was just raised poorly, or something that should be there is missing.. I just don't have that drive to be more "successful" than everyone else, especially if it means grinding other people into the dust. I'd rather have 10 people making 60,000 a year than 1 person making 590,000 and 9 people making 1,100 dollars a year.
That seems more "fair" to me... even if 1 of those 10 people doesn't "deserve" to have that much money.