I honestly don't think any of us would ever sign up for DirecTV if we actually read the Customer Agreement and thought about it.
I just called them to see why I suddenly was no longer getting 5 HD channels I've been watching since I signed up. I was told they had determined that those channels were worth some extra $ to them, so they were now their own additional cost package!
I went to the Customer Agreement and found that they can indeed do that - Section 1 (d).
And if I don't accept the change, I have the right to cancel, subject of course to the early cancellation penalties - Section 5 (b).
Actually, they can also change anything in the Customer Agreement any time, and if I don't accept it, see above....