PPC click costs aren’t the only cost to a PPC campaign. In ecommerce, there are costs to make the products and fulfill the orders. There are credit card processing costs and the cost of returned goods. You also have customer service costs – the salaries of the people who answer phone and email inquiries.
Even in lead gen, where you’re not selling physical products, there are still costs. Consider fixed costs such as those that keep your website running: servers, equipment, and technicians. What about the salaries of the salespeople who follow up on all those leads? What about the cost for marketing automation?