I'm sure your right, but there is nothing that says they wont start doing it eventually and don't think for a second that they wont. Just wait until they get more penetration with 4g phones and other devices. I'm sure its fairly clear right now but wait until the 4g starts getting congested. Those of us with unlimited will be the first people they target.
we will cross that bridge when we get there . but i remeber reading the LTE towers wont get congested and throttling was only going to be on the 3g side