I think it's crazy to believe that subliminal messages have absolutely no effect.
When you live around certain people, sub-consciously you start to develop the same body language as them, you start to talk like them because you've heard them talk so much that it's been embedded in you sub-consciously. Some science studies suggest that you may even start to look like a person just by being near the person.
Why shouldn't subliminal messages be the same? I'm using a program which blinks subliminal messages on the screen so fast that your subconscious mind understands it but your eyes can't see it and so far I feel more energetic than usual (and I realized that I've been eating healthier foods lately)