For patients with complex or chronic conditions, switching networks and losing access to a trusted physician as a result of a job transition, a job loss, or early retirement, can have harmful health consequences.
Blackboard's clients were purchasing products and were locked into multiyear contracts, making it easy for the transition to occur without the loss of many sales.
Naturally, the smart marketer wants to build marketing funnels which provide the cheapest, most economical transition from one stage to the next, while keeping customer loss to a minimum.