I was under the beginners (naive) impression that sending out 10 cards (plus 4 to Sean, Simon and a couple of other non-participating people), combined with the people who has signed up for maximum would get me a good amount of postcards.
Well, I have thus far got 7 cards plus one email in return. So I guess that is a good return, getting 8 out from 14 sent. I will probably sign up in the future, because I like the challenge in itself. And yes, there are cards that are worth it all, no names named.
Thanks to all of you who have made the effort and Rüdiger who manages the exchange.