I personally do not recommend anyone tying there line to a mac address. Both on STBemu and magboxes.
Even more to the point after infomir betrayed those who have been affected with blocks my advise is to see the box out until it packs in and certainly DO NOT buy a new STB from them.
Although there has been a fix this was only done by reverse firmware.
A suppplier should be able to edit the mac address (but not all can)
If your running a user/pass you can run multiroom and/or add it to another device.
(not so easy tied to mac)