There's a problem with the Great Walmart in the Sky:

Online sales taxes are discouraging people from shopping on Amazon, according to a new study by researchers at Ohio State University. Regular online shoppers living in states that implemented a tax on Amazon decreased their spending on the website by 10 percent compared to states without the tax. The drop was even steeper for big-ticket purchases above $300, for which Amazon sales in taxed states were down 24 percent.

Amazon was smart to do battle with local sales taxes, but that battle is largely over. Now we'll see how they do when they're forced to play on a fairer, more level playing field.