With 4G you can easy mash through 50GB a day.
Doing what exactly? Do people just download excessive amounts of data because they can? surely its not out of necessity...
I'm in agreement with a few of the others on here - its been killed off because of the greedy few who are using tethering on a phone contract for their PC's.
Yes you could argue that they shouldn't call it unlimited but I guess they didn't expect it to be abused in the way it has been and 10% of users accounting for 60% of data usage across the network is definite abuse!