This needs to be allowable - I got stuck with my dev site being my primary site trying to test out the WordPress stats. I wish when installing the WordPress stats, it would have said YOU CAN'T CHANGE PRIMARY BLOG. If it said that I would have stopped and uninstalled the plugin from my self-hosted WordPress site. At least let me move back to a WordPress.com hosted blog. It's completely silly and not very helpful to not have any way to change the primary blog. Very inconvenient.
Am I going to have similar issues trying to use and test other Automattic products like Intense Debate?