This still doesn't explain why you even have data caps; or usage plans as you call them.
Whatever you may think and whatever motivation Comcast has for their policies, bandwidth isn't free. The large percentage of normal users shouldn't have to subsidize the heavy ones. If Customer A uses 50 GB and Customer B uses 300 GB, A is essentially paying part of B's bill, while B continues to complain that they should be able to use even more.
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