Number of downloaded apps/installs of an android app

Online android market website gives more details on the number of downloads/installs of an app than the market on a device (phone)!
Check for example 3D Light Racer Basic. On my Nexus One it says it has > 250000 downloads. But on the website it says 500000 - 1000000 installs! See the red arrow.


Can be pretty useful for competitor analysis for example :)