All-in Pricing is a display strategy where the only price the buyer sees is what they will pay. They do not see any sort of breakdown of what goes into setting the price.
The general goal of all-in pricing is to streamline the end price (what the buyer pays) without introducing unnecessary detail into the mix. It also has the impact of making fees a non-issue. Similar to buying Ketchup at the grocery store, you are paying fees the grocer has added in when you purchase Ketchup but there is no breakdown of these fees.