Why does VG Chartz only work for 5 minutes at a time?

[konnichiwa]

And the numbers of consoles sold change to much X_X.

Last week the Wii others numbers has passed the X360 others numbers.

Yesterday the Wii others numbers were just 20k higher than the X360 Others numbers.

And today the Wii others numbers are lower than the X360 others numbers X_X.