How do i find out how many people play ps2 online?

I want to know how many people play Sony-hosted online ps2 games such as atv offroad fury 4 and socom combined assault online for ps2? i already checked the gamespy website since some ps2 game's online stats were on that site.

usually the only game that has people online would be guitar hero or rock band and madden 09 and really any game that is recent and has a high rating that what i did

well you can only do that with a ps3 on ps2 you don't get to ps3 you only hock it in your computer