Have you heard about the book
“Influence: The Psychology of Persuasion”
by Robert Cialdini?
This is one of the “bibles” of convincing people to
do things you want (like buy stuff from you 
)
Here’s a brief video of the man himself
talking about the importance of reciprocity:
http://www.youtube.com/watch?v=tkyGOAWoYxA
Ask yourself:
“What can I give to my prospects that they will really appreciate?”
Talk soon,
George
