Well, I understand (or I might have misunderstood...if so correct me please) that this chain started with a very simple but kind Saolorgirl's deed to another fan, and Paula came up with the idea.
And what makes this chain special is (just my opinion) that it( sharing the love for Scorpions, frindship, and so on) is given from one fan to another, and to another, to another. This is not the same as fans just send things to the band, not "ME AND THE BAND" but "WE CONECTED TOGETHER AND THE BAND".. I don't think sending band postcards was the nail thing--it is just the nice extra--- because we can see how chain spread all over the world in the end, and because the band can see it, also. or have I misunderstood anything? oh well, It's already started, and we can see what happens. As for the gift, of course it doesn't have to be expensive. I thought sending postcards (to other fan) saying hello might be enough to bring us closer.