> My point is people don't want to use multiple services. And the OP's point hinges on the idea that while a given person will want to use only one service, th

> My point is people don't want to use multiple services. And the OP's point hinges on the idea that while a given person will want to use only one service, there's less likely to be a single service that everybody uses, with each consumer buying from the service of their choice, knowing that their book can be read on any device.