Does athletics help you survive/is it worth it?
Yes it does! Now you'll have guys tell you it doesn't matter. That if you play a 0 Athletics build right, you won't die. And that maybe the case for those guys. But the bottom line is that being able to run, move, dodge faster will help you stay alive. Period.
Now the real question is... will taking points from Athletics and putting them somewhere else, be more beneficial (than running fast). That just may be the case with your build. But nonetheless, high Athletics can certainly help keep you alive. But at the cost of lower PD and WPF, well maybe it's not worth it.
Now I'm pretty new to an Archery Build as well. But from what I've been told, take at least 150 WPF Archery.
Actually, check out my post at the link below. You may have already read it (cause it was only a few post below yours) But if not, it could prove helpful. Read my original post, then read Rumblood's response. Good info there. Helpful info on WPF & PD options. As well as info on which bow you may want to use (Rus, Horn, Tartar), and the different options to go along with which bow you choose (cause the Rus Bow takes 2 slots).
http://forum.c-rpg.net/index.php/topic,28996.0.html