I believe the "dismissal" is this cogent argument:
Shuffling bits around takes energy; if your virtual reality services grow exponentially and energy production doesn't, then the price of energy must also increase exponentially or else one of your VR companies could buy all the energy and shut down the competition.
Energy production (and computation) are limited by the capacity of the earth to vent heat into space at a reasonable surface temperature.
So unless you allow for an exponentially expanding real-world physical economy, you can't have an exponentially growing virtual economy.
The price of energy is capped at the cost to privately produce it for yourself, which is probably pretty low in the scheme of all encompassing virtual real estate fiscal gods.