here's a piece of an article I wrote recently (entitled 3 Worst Advertising Mistakes):
Mistake No.3 - Exit Pop-Ups
Ok, this one is probably the most controversial from the whole article, but consider this.
You get a visitor to a sales page, you present everything your product has to offer and you put a price on it. He either decides to buy it or he leaves your page.
Giving him a discount using a exit pop-up window is nothing but a dirt cheat on those people who bought your product for the originial price.
I mean, imagine you just paid $57 for something you could get for $27… not a great feeling, is it?
Opinions? I know it's supposed to increase sales, but I simply consider it an unfair technique and I would never do anything unfair in my business...