I concentrate on niche titles. So for example: How do I get the numbers of the actual week of Atelier Rorona? Wait! I got it... I have to compare the actual numbers with the numbers on the last point of the graph on gamrreview, right? It would be much easier to sort the data according to publishers - NIS America on PS3 for the actual week (I would also love if I can sort it according to developers). What if a game releases and it will not manage to get in the top 40? It would be far more complex to recognise these titles and get the data.
But anyways, I slowly understand the mechanics of vgchartz. It's just more complex than before now.
GT5 will sell ~10 million life time (after 20 weeks around 6 million, rest with legs).