The very act of selling over the web in an automated fashion makes the sale cheaper for Wizz compared to selling via a ticket agent. And, no bit of code costs W

The very act of selling over the web in an automated fashion makes the sale cheaper for Wizz compared to selling via a ticket agent. And, no bit of code costs Wizz £10 per sale. Ad revenue isn't needed to recoup sale-costs, because those exist for people who do not purchase. Those costs are zeroed out for the people who do purchase.