Mmh, I'll try to explain.
Comgnet is a retailer chain which makes available its preorder chart daily and its actual sales chart weekly.
In these charts the points represent how much a game is preordered / sold. Probably one point equal to 1 customer.
What is interesting about the Comgnet charts is that we can extrapolate what a game could have sold, or could sell if the release is not come yet, seeing for example the ratio Comgnet points / thousands sold of other games of the same series or similar when we are talking about the last day of preorders or the Weekly Sales Chart, or making comparisons through seeing how much points the precedent game had at the same distance from release.
And for doing this, there are some "rules" that normaly are respected.
- Games on a newly released platform, especially if it is growing fast, can have with preorders a Comgnet pt / real k sold ratio a little bigger than one or equal to one, even if they are RPG.
- Nintendo games tend to have a ratio of one, or even under one, especially if it is a casual title ( example: Wii Party did 59pt in preorders )
- Casual games are not preordered a lot.
- RPG are heavily preordered, and they can have even a ratio of 2.
- The ratio is higher on Sony consoles than Nintendo ones, even for the same genre ( example: Taiko on PSP did 180pt of preorders, the first Taiko on Wii 60pt )
- If a console suffer with low sales, ratio can be high, but if the console start spreading, the ratio will lower itself ( PS3 is the main example about it, with PSP )
- Considering sales points instead of preorder points, the ratio normally is 2:1 (3:1 for some RPG, or just a bit lower than one or even one for casual games and some Nintendo franchises )