Why You Should Sell First Then Give It Away For Free(tech.li)
tech.li
Why You Should Sell First Then Give It Away For Free
http://tech.li/2012/02/why-you-should-sell-first-then-give-it-away-for-free/
http://tech.li/2012/02/why-you-should-sell-first-then-give-it-away-for-free/
Giving something away for free should work, as long as it is valuable and related to the product. I think that was the case in the example given, though it is not immediately clear.