I would suspect that the reason that many people fall for it is that the feel / psychology of the spiel is very up-beat / positive - therefore by the end of it - you don't quite know any more what it is offering but you feel good! therefore you want to know more - the spiel deliberately focuses on the up-beat positives - the tantilising possibilities - the goals of success - all pressing on the buttons of what the viewer wants... but deliberately doesn't tell you the precise details - therefore you need to sign up to find out more... it is a very clever marketing approach - but perhaps not ideal for members of EP who are perhaps a little more cynical than the norm?!
I would suspect that you will get a different group of people signing up based on different sales pages - so it won't just be about the overall numbers, but perhaps the type of person...
If the product is very good then a shorter - more detailed page will bring in the higher calibre / longer lasting customer - but numbers won't be as high... (less of a sales pitch may put off the less experienced)
If the product is not very good then the longer - should bring in more (lower calibre) people - who won't stay as long...
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