Who stands to gain from ATC privatization?

I have seen nothing to suggest that privatizing air traffic control
services would meet any need of society. It would, however, make
SOMEBODY a bunh of money. "Philosophy" aside, I see absolutely no
benefit to privatizing ATC services - certainly not based on the
experiences of ATC privatization elsewhere.

In Australia our ATC has been 'corporatised' for several years now
and they into a 'cost minimisation/recovery' mode.,
ie. no face-to-face briefing offices, fees for IFR operations,
fees for landings at towered airports, charges for not lodging
flight-plans via the internet, and with the upcomming NAS revamp
there will be less enroute services in outback areas.
(and that's just ATC., the private airports have their own fees)

The only way a private operator will even think about running *any*
ATC system is if they can make a profit from it. This means either
recovering *all* costs from the end-users, or else by getting a subsidy
from the government.
If there are subsidies then the total cost will probably be *more*
than if the government provides the services themselves.