Re: What do you expect?
"users get an unlimited amount of data" or "speeds are reduced when they exceed their allotment"? They both can't be true at the same time.
WTF? Of course they can. "unlimited data" means exactly that: you can keep on downloading until the cows come home and no-one will ever cut you off. It's completely independent of the speed you download that data at.
Of course, moving data has a small but finite cost per item, so if you truly expect both quantity and speed to be "unlimited" (within the obvious bounds of the speed of light, so speed can't really ever be "unlimited") then the cost would also have to be unlimited. Would you be OK with that as a condition of your package? I doubt it.