We have heard your feedback on this, and it is not our intention for you to earn tokens and not be able (have the required reputation) to spend them before reaching a cap. For now, the team is going to increase the cap for Marks of the Longbeards to 400.
If you must have a cap, please raise it to at least 500! Or better yet just remove it altogether, 400 is pushing it, you will barely be kindred IF you use rep accelerators, think of all the people who do not?