They payed me!

Have you seen that many people or programs post a payment proof: a screenshot with their money at the bank. Some programs even demand of their members to post a proof at their forums if they want to be paid again.
First i found it very stupid. Why they share with so much people an information what must be qualified as a bank secret. Do the people just like to feel themselves powerfull and to cuddle their ego with the compliments of the others? And who cares about the money received by somebody unknown from the other part of the world?
Actually this is a method for manipulating the others. And it works. Most people are prone to believe to a document then to some words. And all of us when see full account with payments -think that this program is really reliable and we can trust our eyes.
Be carefull. Our eyes can be easily lied by just some simple montages with PhotoShop. But of course, you can use the method when you promote: as i said, it works:-)