Starcraft brood war ladder

Why not make classified 2vs2 3vs3 or 4vs4?

If you ask why there is only a 1vs1 ladder and not a 2vs2 too that is because they still delivered their promise for a 2vs2 ladder.
If you ask for why there is only ladder Brood War but not with normal StarCraft it seems to less seem to care but honestly I do not know.