well...madden is american football. its not played anywhere else in the world. most people outside of america dont like it. but yeah, for the rest of the world, 20000 and 30000 does sound really low.
if its not charting in the top 50, the numbers may just not be getting updated.
like the game Nights on the wii. it just got released in others, but didnt sell enough to make it into the charts, so theres no data for it.