I have to respectfully disagree with the OP's suggestion that Bic lighters are a bad idea for survival preparedness, It's been my experience with Bic lighters that they are extremely reliable (not so much for the cheap imitations found on the market).
Having been a smoker for too many years I used Zippo lighters and kept Bic lighters as a back up, as far as the flint that comes in Bic lighters I've never seen one wear out before the lighter runs out of fuel, in fact I used to pick up discarded Bic lighters that had run out of fuel and saved the flint (ferro rod) that was left in them, usually the used flint that remained was longer and sparked much better than the commercial replacement flints that come in the five packs at the grocery store or smoke shop, and they fit in Zippo lighters like they were made for it.
Some of the usual complaints about Bic lighters by outdoors people are that they don't work when wet or that they don't work well when the temps dip below freezing, This is the first I've heard about a flint (ferro rod) in one corroding to the point that it was rendered useless, IMHO Bic lighters are regarded with the same respect and on an equal par by bush crafters right along side of Mora knives.
All that said, anyone that wonders around in the wild places where there's a chance of being thrust into a survival situation, or that has to count on making a fire for warmth, to purify water, or to prepare food, should never rely one only one means to effect fire, if they do they well deserve the discomfort and inconvenience that they have earned.
I have through years of experience learned that the most unreliable means of making fire are common matches, I carry several Bic lighters in my pack's various pouches such as the fire kit, first aid kit, and cordage bag, as well as a ferro rod or two in my pack and one on my belt knife sheath, and often carry a small flint and steel kit in a small tin in my fire kit.
I'm a practicing minimalist and carry very little in the way of redundant gear, but the means to make fire is not one of them.