Can you explain how? The situation here is: - Customers bought the devices without the 30% rule in effect - Amazon introduces the 30% rule - Customers will n

Can you explain how? The situation here is: - Customers bought the devices without the 30% rule in effect - Amazon introduces the 30% rule - Customers will now be asked higher prices to make up for the lost revenue The razor-and-blade model is about selling one product cheap to increase sales on a complementary good. It's not about a vendor changing the situation, as is the case here.