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Sounds reasonable to me
I think this is a good solution for ISP's looking to manage their over sold pipes. Just change this to the monthly quotas that many ISP's have done and set a minimum speed that you'll hit when you exhaust your quota that isn't absolutely terrible.
That aside, the management aspect of it in a domain environment are far and away the best thing ever. Splitting up the Pics/Vids/Docs folders was the best thing MS did in this regards. Yes, I know Vista had this too but 7 runs much better with fewer resources.