the majority or member area videos are only about 10-15 minutes long so if you have a 5 minute sample of that clip it's 1/2 or 1/3 of the video!
would you go see a movie at the theater if the trailer clip was 45 minutes long and showed the ending?
so if a hollywood movie trailer is 2 minutes long for a 2 hour feature, why are porn people making 5 minute trailers for 15 minute features? do we know something hollywood doesn't?
or, are most people in porn uneducated morons that don't know how marketing works? monkey see, monkey do
it's like a restaurant offering all you can eat tender-loin hoping the customer will buy desert!