I agree, but I think the real reason is because the owners didn't like people taking photographs inside their arcades. This is the reason why this aspect of social history has gone largely unrecorded and historic research is so difficult.
Unfortunately, this attitude still persists today. On three separate occasions I have been walking through modern arcades in Blackpool with a camera hanging around my neck (not an unusual thing to do in a town like Blackpool) and I have been accosted by some jumped-up member of staff shouting "Hey you can't bring that camera in here". In all cases, the lens cap was still on, and I had shown no intention of taking any photographs.
I don't know what they've got to hide. Perhaps they think that, by taking photographs of the machines, I will somehow be able to work out how to cheat and win a fortune off them.
As long as this blinkered attitude persists, the amusement arcades and machines will continue to go unrecorded for future generations.
What do you think?