I understand there is a problem with the security and it seems funny that all the minibars sach as the http://www.frost-minibar.it have the same key. But look at the problem form the producer point of view. If we at http://www.frost-minibar.it were to make an individual key for every minibar, and you know how clients in a hotel are always losing the keys, can you imagine the difficulty, for the hotel managment and for the producer to keep track of all the keys, al the codes etc.
Regards