This is kind of glossing over the point. We all know SSL is good and should be used everywhere. But the simple fact is that to have a fully capable SSL server you need two things: A certificate and a unique IP. There are firms now offering free certificates, but not everyone has the choice to select them. And IP certainly aren't free on most hosts. Sure there are always solutions, like moving to a self hosted model and so on, but it is a significant inconvenience for most.