As far as not wearing out I think the two methods mentioned: bow drill and magnifying glass are the only 2 that I know of. Will they fail in wet or windy conditions? Probably!!! But, in a LTS situation you're not going to have to start a fire each and every day in all conditions. You'll more likely have a fire going over days at a time. That being said....I'm sure that you have redundent fire starting devices....matches, bic's, sparklights, etc. So, being one of those "crazy" people myself I say have a few ways to start a fire and you'll be fine.

I have one that you can use in multiple ways...
Old hand cranked generator...
You can use it to create a spark between two wires, heat a filament to start a fire with, or you can create hydrogen and oxygen from water that you could then ignite with a piezo lighter(or just about ANYTHING else <img src="/images/graemlins/grin.gif" alt="" />)...
If you want portable, you could get one of the handheld military ones that you just give a sharp turn to and it should produce enough to get a decent spark...

JRK for the win! <img src="/images/graemlins/smile.gif" alt="" />

One of those "Why couldn't I think of that?" ideas.