What do you fight for in D&D?

[NichG]

Legend - My name shall live on after the world burns and the stars go out, for it is etched into the fabric of the cosmos itself.
Joy - I am very, very good at battle, so I shall subsume myself in it.
Survival - I'm being attacked! Good thing I'm paranoid and packed a sword on my vacation trip to the mysterious mountain inn.
Change - I wish for something about the world to be different, but it's not like it'll do it on its own.

Its not the campaign, so much as what the character can make of the campaign. A good character benefits from harmony with the campaign, but they keep going even when the campaign's motivation is flat.