No reason. As the Washington Post reports, you can use pocket-lining tricks like region-coding for selling other kinds of “content” — like printer ink:
H-P has quietly begun implementing “region coding” for its highly
lucrative print cartridges for some of its newest printers sold in
Europe. Try putting a printer cartridge bought in the U.S. into a new
H-P printer configured to use cartridges purchased in Europe and it
won't work. Software in the printer determines the origin of the ink
cartridge and whether it will accept it.