You're in the wrong place if you want to argue that the lack of a tax is in effect a government subsidy. When the government doesn't put a gun to my head and take money by force, they're not giving me something for free.
Online retailers have the disadvantage of the immediacy of delivery as is the case with B&M retailers. They also have the disadvantage of shipping costs that don't scale the way that it does for storefronts.
Personally, I'm in favor of getting rid of any tax I can, so we can better restrict the size of government. I realize Bush and republican politicians in general aren't in favor of smaller government, but I'd bet you'll find many here on FreeRepublic who still are.