These books are so potent that anyone who reads them is sure to become krishna Conscious, so it is a very valuable service to distribute our books.
There is sufficient merit in our books that if you simply describe them sincerely to anyone he will buy. That art you must develop not the act of lying, convince them to give by your preacing the absoulute truth not by tricking. That is more mature stage of development of Krishna Consciounsness.
A person who does not actually utilize his human intellingence to get out of the clutches of maya, the cycle of birth & death, is accepted as miserly.
Detach the anchor of attachment towards collecting wealth and attach your mind in chanting & remembering Lord Krishna.