Here are Plugins & Snippets collection of downloads related to Average Order Value. Please have a look if there's any download that could be of help to improve and enhance your Easy Digital Downloads WordPress webstores.
The average order value is the last determinant of your revenue number. Important here is to be aware that your product selection will set the stage for the price points you can offer. Simple products mostly will go for low prices, while more complex ones can ask for a higher price.

Source: How to Build a Digital Product Marketplace in WordPress - Plugins & Snippets