This is a useful app and certainly worth more than $4.99 to most people who need it. I wish he annotated the graph to show how sales numbers varied with the sales price.<p>Personally, I'd have a separate site that marketed the product and then directed purchasers to the AppStore. Getting less than $19.99 for something this useful is ridiculous! Make it easy to use with automatic whiteboard cleanup, annotations, and target it to the right industry and it should be worth a lot more.