That's every account that's completed the 5 placement games. If you exclude "inactive" accounts (only Blizzard knowing what exactly counts as inactive), the ratio pretty close to 20/20/20/20/20.
I vaguely remember reading that they count this as abusing the system, and could get you temp banned. I wouldn't recommend it.
actually i think the fella who was doing this was this code S korean who was win-trading. gomtv took action against him but not blizzard because there's nothing in the EULA that states that his action violates it. He didn't modify the game(maphack) or use any known bug(space colossus/immortal warp etc) to his advantage. If someone is willing to lose games to you, then so be it.
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