The way I understand the cess-pool issue is that with so many players the ability to communicate is lost due to the text buffer being overwhelmed.
For those of you familiar with World of Warcraft, it would be akin to being forced to be tuned to the Trade channel at all times. All of your chat with your friends/raid/guild would be overwhelmed by the sheer number of messages coming over the Trade channel. Then you get a few obnoxious people who rile up some other people and the chat becomes dominated by a hostile argument. Trade channel in WoW is a cess-pool for those reasons.
That is how the country channel is in AH when the server populations get too high and it is the same reason most players in other MMOs don't keep global channels tuned unless they are the aforementioned provocateurs.
1 chan 200 Xmit = 1 perk. Ka Ching.
1 Country Xmit = .5 perk. Ka Ching.
Range, squad, private, mission Xmit = free.
Squeekers... 10 perks per Range Vox Xmit.
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Wab