Drug dealers are astute businesspeople. They know their product is so good they're willing to give a little away for free upfront. They know you'll be back for more---with money.
Don't be afraid to give a little away for free---as long as you've got something else to sell. Be confident in what you're offering. If you're not confident about that, you haven't created a strong enough product.
~ Rework
Change the way you work forever by Jason Fried & David Heinemeier Hansson (creator of Basecamp)