The Bicycle inner tube trick works great if you are not using the lighter, a good way to carry extra lighter fluid is in a plastic "nip" bottle they do not disolve and I have not had a problem with them leaking in my bag or breaking.
Very true but it's a lot more labor intensive and in most cases really isn't a good alternative in a survival scenario.Fire can be used a building and cutting tool too. If you had to fell a large tree and had only fire you can still do it. You can set multiple fires along a log to get it into managable sections. Fire can be used to split stone. Obviously it needs a lot of effort and supervision, but it can be done. Fire as a building tool is often overlooked in the list of uses.
http://www.native-art-in-canada.com/fellatree.html
I have yet to NEED a knife in the woods. Axe or machete are awesome for making things happen quickly and efficiently. My setup has been a hawk and a 2 1/2 inch bladed knife and have yet to feel that the knife is too short.The more i learn about bushcraft before metal tools and how to make things with no metal tools the knife has really no importance to me unless it's an axe or machete.
For survival i don't personally see ghe point of a knife, for bushcraft where complicated notches are used and intricate carving is required in a speedy manner then the knife becomes important.
For shelter building a 4 inch blade isn't needed whatsoever, You don't need a knife for prepping small game or small fish, you don't need to carve anything,
Fire on the other hand will get things done.
For survival i would wan't a half inch blade or an axe
In what sort of area would you anticipate being lost overnight with just a lighter? What would be the particulars of the scenario?
Or your flight crashes in a remote stretch.someone who happens to be a smoker but is carrying no survival gear with them.