Why does anyone write anything on the internet? Why am I writing this? People write for lots of reasons, and the motivation for writing walkthoughs and FAQs are

Why does anyone write anything on the internet? Why am I writing this? People write for lots of reasons, and the motivation for writing walkthoughs and FAQs aren't any different to anything else: because people like expressing themselves, they like getting recognition (even if it's meaningless internet points), they're writing something to use themself, or they like the idea of helping out a project they support.