Fix the registration key issue please

We all change our PC's etc at some stage. So why do we have to contact the devs every time we change one? Why can we not disable our own serial and then activate it again on a different machine instead of having to go through the whole 1980's process of contacting Maptiler and asking nicely if they will kindly disable it and allow us to use it on a different machine... Is there no way to make this easier?