What Is The Point Of Leveling Trusts?

[Reap00]

That's the problem right there,

In order to level them you have to run the same dungeons over and over again in a row. You're going to get so sick of those dungeons that you will never want to play them a gain... so it defeats the purpose of it.

It doesn't defeat the purpose. If you are bored then run it on another job. If you don't want to do that do something else.