Hmm... So you buy a CD and your name gets in a list.
Each list entry get his present of choise when 4 orders for this CD are placed. In the current setting : 1 present is given, 13 people in line= 13x4 = 52 order before you get your presents....
I don't know, I find it a little bit strange to get such a big present..... Not something I will get into... Perhaps other people don't agree with me ??