1. Weekly sales - accurate trends over large periods of time. You can see when a game boosts a console sale in a given week e.g. Wii U and Monster Hunter.
2. Comparing the PS3 and 360 is actually more important than that as you have to factor in launch dates and cumultive changes over time. E.g. 1% weekly difference adds up over time.
3. What does it matter if a console has a "bigger exclusive"? Are you suggesting that the 360 should now invest more into Forza? Should GT start to include Spartans to increase it's audience? Having the biggest exclusive is just horn bashing with nothing really to be gained from it at this stage considering consoles sold etc. Something like SSBB was interesting as 35% of all GC owners owned a copy but there is no significant here between these games. It seems to be more a part of the "my console is better than yours" mentality that plagues console gaming.
4. Comparing games of the same genre can indicate how receptive the market is. For example, look at Grid vs GT, or any arcade game vs GT. It shows possibly that a well established name is important, or maybe that audiences currently prefer realism. Or maybe it's testament to one dev producing something of a higher quality than another.
5. It's important to know which console had better marketting than another because being a sales site this site should be (be sure as fuck isn't) used for gauging future success of other consoles and therefore help you with investments whether it's avoiding a console or buying stocks and shares. Basically, do you gain any business insight from knowing if GT sells better than Halo? If the answer is no, then why ask the question? In comparison you can learn a lot about consoles and games of the same genre by comparing sales.
1. Yes, some weeks are important. But most weeks have few new games and are pretty much the same as the weeks before it. Example, all the summer weeks. For the past 4-5 years, the summer weeks have been essentially dull. Anyone could predict what sales would be like during the summer since there's very little change. Yet week after week, the Global UP threads would get massive posts. Seems weird, doesn't it? These pointless comparisons are the backbone of VGChartz.
2. I was talking about lifetime sales. At the end of the day, their difference is going to be very tiny. So if one manages to edge over the other, it's not going to mean a thing. It's not as if developers/publishers are going to change just because the PS3 managed to outsell the 360 by 1-2 million units. It's pointless, but they are the backbone of VGChartz.
3. Again, I personally am not going to argue how it's important because it's objective. But here's something: Whoever has the bigger exclusive title obviously has more fans willing to buy a console for that exclusive. Likewise, this means when their next console releases, we can evaluate how big of an impact that exclusive will have on hardware sales. There, a good reason to be interested in comparing the two biggest exclusives on competing consoles.
4. Like above, comparing the biggest exclusives on competing consoles let's us know how big of an impact these games will have with the next generation consoles. How is that less important than what you said.
5. Gauging future success. Yup, exclusives are very important in that regard. Yes, you do gain business insight knowing GT sells better than Halo. You know that GT would likely boost lifetime sales more than Halo would with the Xbox.