Turbine is encouraging you to get in and level up in preparation for Helm’s Deep with 30-days of 100% experience boost being added to the game.
Helm’s Deep launches November 18th and this experience boost is to last until November 17th. It does stack with all other forms of XP boosters to really allow you to pile the XP on.
Get ready for Helm’s Deep with 30 Days of 100% XP Boost! Now through November 17th. (And yes, it stacks with other forms of XP boosts)
— LOTRO (@lotro) October 17, 2013
This is an automatic buff applied when you login and no you cannot get rid of it. You can buy a Leveling Disabler in the LOTRO Store that will stop all experience gain. While I see no reason to rush through the game especially for those new to LOTRO. However, long time veterans with an army of alts really appreciate little gifts like these.
They’ve done XP boosts before an expansion launch before but to my knowledge this is the first 30 day experience boost!