Realisticly, i would initially be scared, but of course I would fight the good fight. After all, these "monsters" over take your home town eventually in every game. It's like asking if I would fight for my country if were invaded. I'de be scared of death, but I would end up dieing regardless. Might as well fight for it.

To me, the princess saving would just be a bonus, or help, to save my people. THe bonus being, I may get some action from hot royalty. So, there is a benefit for Link.

It's like Heroes "save the cheerleader, save the world".

There is no benefit for them to save the world, except to save others. Link gets plenty of benefits in that he gets to talk /slash gauk at hot royalty female body (and being I just risked my life for months to save my people and ultimately save her, you better believe I am going to grab some butt as she walk away) and being able to know his friends and village are safe once again.