Give an xp reward for repairing/upgrading a door.

Get the amount of xp/coin spent ratio right and you'll have a stream of people going out into the frontiers.

1) The benefits include the fact that keeps will have higher level doors with all that that entails
2) It should increase action for solo/small mans which will increase action for 8 mans
3) It's self limiting in that you're draining coin from the realms, there are only so many doors to repair, and they can only go so
high
4) It's not something that is helped by having high level friends do things for you which is part of the problem of high xp quests

Even if you think this is a dumb idea (and it probably is), if you really want to increase the leveling rate it should come from something involving the frontiers. There's something to be said for RvR action increasing as kills are easier to get and people go to defend those potential kills. There seem to be two drains on the population to Camelot, both on live and here, to slow xp and to little action in RvR. Fundamentally people want to log on and kill, they may not be able to get groups so doing things to increase the action for solos/small man should be focused on as well and doing something to draw more people that are 35-40+ into the frontiers would help address both goals.