I often have heard it said that if people buy the product a company is selling, then the company must be creating value in the world. After all, why would someone buy a product if that product were not creating value?  It would be nice if this were a valid argument (since then more units sold = more societal benefit). Unfortunately, it's not valid. To help put the argument to rest, here's a list of 13 situations where a product that doesn't add net value to the world may still get bo...