That's what the expansion is for. You pay for the content including all that comes with it.

Years ago, LOTRO started adding zones that were easier to level, better gear drops as well as two new classes that, when played right, were OP in comparison to the classes available in the base game. It essentially separated the players willing to part with RL cash in exchange for allowing them to be in the "diamond club." I don't think we'd want to see that here.