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I think the most obvious usage of subliminal messages is by the fast food industry during super ball events between "quarters".
For a small part of a second it would show a "ripe" burger or pizza. To the conscious mind there was nothing but the picture of the field. However, to the subconscious the story is told and there is a decision to be made.
I hope this suffice as a good example.
I think they use it for attract people and make them more curiosity about the message .