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All infomercials make money for the station. They usually air at times when viewership is low, such as late night so the station is still making money even when they might have a hard time selling spots in a regular show.
The money is there for the station whether people are watching or not.
Also these stations are probably just operating with a single master control operator late night. I don't know if they have found a way yet to totally automate TV stations like radio stations often are but they may have.
There is no requirement for a transmitter engineer to be at the transmitter all the time like there once was.
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