If you insist that they are wrong, they stop being your customer* (if given half a chance).
People spend their time and attention and money in places that make them feel valued.
*There’s nothing wrong with asking customers who are wrong to leave. Just be sure you do it on purpose.
by Seth Godin
http://sethgodin.typepad.com/seths_blog/2012/05/the-reason-the-customer-is-always-right.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+typepad%2Fsethsmainblog+%28Seth%27s+Blog%29