I have a runtime version under way but its quite a different beast. It renders charts to textures so you can view them in your game either like a menu item (player stats), or as part of your game world. Its probably going to be around $20, but you wont be able to include it in your own assets.
Presumably because its in the editor extensions they have added the text “this extension requires one license per seat”, this is not correct.
Not only do you only need one license, you can then embed the product in as many assets as you like (as long as you don’t allow your users to resell your asset).