My suggestion would be that you run a TI on the 135-150 TI and the reward would give a bloody branch as part of the reward if your character is already base 150.
This would motivate the 150s to run more TIs, thus increasing the number of parties being run and more players willing to participate in the TIs. This would also motivate the lower level players who get bored of doing TIs (so they stop leveling before they hit 120 and make an army of noob 3rd class instead) to get their characters to 150 as well.
This would also help guild leaders run more events that are guild oriented as well since everyone likes a good BB party.
As a player with several 150 Characters I feel no obligation nor take any interest in running TIs any longer aside from gainIng un-needed guild exp. I accept that the exp I get on this character is going to waste aside from what is dumped into guild exp so I would like some kind of reward in place of this. Let's face it, Merit Badges don't make a TI worth running at 150. I could be (and do MvP or PvP) instead.
Just a thought but I figured I'd throw it out there.
Edited by Tyrael, 01 June 2012 - 06:48 PM.