I've read many books on "selling" and I've also been a business owner for 12-years and dealt with salesmen quite heavily during this period. I know all the tact

I've read many books on "selling" and I've also been a business owner for 12-years and dealt with salesmen quite heavily during this period. I know all the tactics, in other words. And I've never met a single sales person within those 12-years that did not resort to dirty tricks. Not. A. Single. One.