A paper letter for notes seems ever so more personal than and email (esp. an email to a group). I guess it has to do with a bit of psychology and Kinesthetics. It's kinda like holding a paper book and reading vs. reading online or on a digital "book." if I want to make notes or underline, I need paper. there is something that satisfies and calms to sit down with a real letter or note vs. reading it on your phone. The paper and handwriting seems to make it more personal and caring.
So, keep making those cards and sending them to someone that will get joy from receiving them! Anyway,isn't it supposed to be more joyous to give than receive?
How about posting some of your cards that you intend to send either here or on my facebook page?