App Cooker is an iPad app that helps you design other iPhone and iPad apps. Here’s a screenshot from their web site:
I don’t think I’ve ever seen a company do a better job of explaining why prices will be going up. They clearly chart out the increase in value at every stage.
I suppose it helps that they’re actually delivering an increasing amount of value. Contrast this with the rising prices charged by wireless phone carriers, which delivers the same (or less) value as your costs go up.