Attention used to be delivered. Now you have to earn it, moment by moment. I wrote recently about how QVC built a powerhouse by creating and perfecting a format that still dominates product selling today. A host, a product, a time slot, and a guaranteed audience … always watching. For many years, if you got your product on air, it got seen by a known number of real people. A percentage of those were sure to buy it. That was the system. The system was good, and very lucrative all around....