[not to beat a dead horse "too much" again]
MRV adds additional maintenance of network infrastructure (in this case DECA). This is something new and was never part of things DIRECTV has maintained in the past. It's doubtful (to me) that DIRECTV is out to make lots of money on this. More a way to structure the costs so that folks can have MRV without it causing a burden to every subscriber.
If the charge was actually "to support" DECA, then that's one thing, but if the customer used their own network and supported that themselves, then this should be FREE.