Personally, I like to see others Calling cards and will usually have a quick glance at these even in hard rain whereas, like others have said, in order to keep the logbook dry I sometimes have to be very economical in what I will record in the log book. However, what seems a little worrying is the number of "RULES" that some appear to try to attach to our fun and very open hobby. With common sense, there's no need for rules on how to behave. I'm sure the hobby gives different things to different people so why worry?