I'm A Banana
Potassium-Rich
S'mon said:"This benefit is meaningless without mechanics!"? Hm, I'm not sure I agree. On the one hand, if the 'game' is the dice, then that makes sense.
On the other hand, if the DM describes my Thief being called to adventure from his velvet-cushioned, concubine-appointed boudoir, that certainly feels different - and preferable - than being shaken awake in a stinking gutter. The boudoir doesn't give any mechanical benefit in combat, but from the POV of my Thief it's a more important reward than another '+' on his magic dagger.
It doesn't replace the + on his dagger, though. You can slap it on top, but you still need the dagger's +.
Yeah, it's potentially interesting story material. But that's down to individual DMs and players, really. It's only valuable if you make room for it to be valuable.
Because it's fluff, it's also something you can have from level 1. My dwarf bard is always called to adventure from his velvet-cushioned, concubine-appointed boudoir. The fact that your thief isn't is an intentional choice for you to define your character (and their desires) in that way.
Now, if 4e had a system like a lot of more narrative games do -- one in which your character's desire plays a central role in how you grow and change over the course the campaign -- that would be a slightly different story. Suddenly, your thief's boudoir and my dwarf's ability to break the cycle of poverty and bigotry in the world become things with a mechanical weight (even if it's just XP, though it could be more than just XP).
But the game doesn't care much what your desire is. It assumes you have one, probably, and a DM will, probably, help you achieve it, via violence done to monsters with + daggers. That's all free-form, though, so it doesn't actually feel much like a reward if you can have it if you want it anyway. Your thief achieving his boudoir -- that my dwarf has had all along -- is rather hollow, since you could have just chosen to get it at almost any point.