Yes, I was asking that myself, too! I found out that GL was in the "top 30" of the amazon sales here in Germany far longer than any other MK album before. And even if it left the top ten very soon, it was around place 20 until two weeks ago... Today it is on Nr. 41, so falling down, but that took a long time. So it must have sold pretty well. But how can we get exact figures?
LE