Comcast wants to make due with compression and limited connections to the CMTS's without having to spend extra for a bigger pipe to the customers area. Docsis 3.0 is going to be a joke. The current connections can't handle the bandwidth requirements. Capacity planning is still not going well and never will from what I can tell.
Yeah they will throttle your traffic because when they put 300-400 people on the same node all sharing the same pipe they have to.