Asking for a copy was the easy bit.... Actually reading it is the hard part.
This book might positively change someones business, how many people do you think would have asked for a copy if you had asked them to pay 99p for it?
Anything given free has no value, the fact that you offered to give it away diminishes it's persevere value.
Ps: just for the smart Alex who will say a childs love is given free and is priceless.... We are not talking about business concepts