You only notice it when it affects you, no matter what. For me, it's now the double cumulus day (Thursday for us on Lake Constance, don't know if that's the case throughout Switzerland) I used to always go shopping on Thursdays. Since I also go to work, I no longer have a fixed post office day. So far so good, I thought, until the first Cumulus statement arrived. Oops, so few points, a mistake? No, unfortunately not, double is double. And that counts. As it's certainly not just me who can't go shopping on a double Cumulus day, I wonder if it wouldn't be possible to choose a freely selectable double Cumulus day which is saved on the card or whatever (I don't know much about IT/programming).