Not referring to that
Men at Work song, which is awesome by the way, but the separating of the population on the AH clipboard.


The reasons are twofold: It only shows limited choices of arenas, which excludes the events arenas and also makes the total population look smaller.
If you want people in special events, show them the arena numbers
before they log into Melee, in addition to the current message displayed when you enter the arena. And numbers attract numbers. Dividing the numbers into tabs doesn't make the numbers or therefore the game, look good.