This is another why i'll stick with PSN #NoTax, even microsoft/xblive charge sales tax.
You do realize that in all of those countries, if the law states digital goods Sony is forced to implement sales tax right?
Some US States, the PSN store charges sales tax in accordance to their state laws. PSN isn't some end all be all of existence that is above the law. I wouldn't be surprised one bit if in all of these countries the PSN store starts charging sales tax.
A quick google search shows pages of results where people from around the world are bitching about being charges sales tax from the PSN store.
Sales tax is not dependent on the platform its on the government of the region. So if you live in one of those countries, congratulations you just got sales tax.