V2G is a pipe dream. Nobody has gotten out of the pilot program phase, largely because the return on investment isn't convincing. If you can't make a profit off it it doesn't happen.
Seems a bit early to come to this conclusion, but I would also suspect, that the value of a parking garage full of EVs is not in providing energy to the grid but as a large scale consumer for load shaping.
What do you mean? If the house takes less energy from the grid (compared to doing nothing) it's effectively the same as if the house uses the same energy while also feeding the grid with the car's battery. The former, however, takes less additional infrastructure.
