The ability to easily see a kits rolled up retail pricing in the product catalogue. When you search through kit items in the product catalogue you can only see what the kit cost/retails for if you have the custom kit pricing selected. If you uncheck this, the pricing section disappears.
If I have a customer call up and request a current price on an item that is a kit we build in house, and I want this kit to have dynamic pricing i.e. not have the custom pricing box checked. The only way I can get the price for them is to create a sales order and then add the kit to it.