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If you're expecting high demand you can always put your main file servers on BT duty, that way everyone can use your hefty bandwidth until it's at capacity, at which point the client starts asking around.
"I pay money to have less problems, no more."
you pay that money to MS and expect less problems? surely that only guarantees more expensive problems.
you must remember than this is a wide open free beta, no one's paying money, they can waste the money you pay them on lots of bandwidth for all the fanboi 12year old kids who want to play with vista before anyone else, or they can limit bandwidth and access and hope that as demand for the beta grows previous downloaders will seed to bittorrent trackers, therefore increasing the availability of the beta, which can only be a good thing for them, and making it slightly illicit, well, you had to sign up for it before, which is exactly the kind of rebelious things those aforementioned kids are after.