If I wrote wikipedia entry about picking coconuts, it would be immediately deleted because personal experience isn't a citable source. I need to tell some other fool about what I do, have him publish it in an article, and only then am I worthy of sharing my knowledge on wikipedia.
I've seen absolute hogwash in wikipedia articles about my field (not really picking coconuts lol) but I can't correct them because I can't find an article where someone else has written about the topic.