Len14043 said:
I have a question for anyone familiar with the operation of stations. Once a station decides to run IBOC, how much does it cost to maintain IBOC after the initial costs such as installation and licenseing fees are incurred?
Ignoring issues such as salaries (since it's obvious that most HD stations aren't hiring extra people just to maintain and program the HD signals), the ongoing costs are exactly the same as the cost of running an analog station. The equipment needed to produce and transmit an air product must exist and must be maintained.