LOTRO Points (or LP) are another kind of currency. While they can be earned through certain actions within the game, they can also be bought using real-world money. LP are used for purchasing in the LOTRO Store, they are not needed to purchase goods from vendors in Middle-earth.
Mithril Coins are a premium currency that can not be earned in-game, they have to be bought from the LOTRO Store using LP. Unlike LP, these coins are usable for certain transactions in Middle-earth, although all of them can be considered a premium service. Among its uses are unlocking travel-routes without having to discover them first, repairing equipment at any location, and teleporting to the location of quest objectives.