If you chant this Hare Krsna mantra, there is no loss for it, but there is great gain. This is the significance. We are distributing this Hare Krsna mantra not with any charges: free. We are chanting. Anyone can hear and repeat it. So there is no monetary loss, but if you chant it, then you have got the greatest gain of life. Therefore Caitanya Mahaprabhu says, param vijayate sri-krsna-sankirtanam: “All glories to the chanting of these holy names.” Why? Because it cleanses the heart.

From Srila Prabhupada’s lecture on May 9, 1972, Hawaii