Some would argue it's because of threads like the 200gb a month usage thread we had yesterday and the day before. Where someone has used their phone connection as Internet for the whole house after closing their broadband account. If you sell a contract on the word unlimited you should stick to the contracted term, not talk about throttling in the small print.
Well let them charge homebroad band prices on unlimited cellular phones. I pay about $26 a month for 10GB of use. That is 2.6 for each GB!