Of all the stuff I write, probably 75% never gets recorded. Sometimes it's because I've read it at shows a few times to lukewarm response. But usually it's because I think it's not right. I will sometimes rewrite the same idea a few times before it feels good. I do this as opposed to taking a piece and tinkering with it in an effort to make it right. The earlier drafts wouldn't (and shouldn't) get recorded, because they're not as good.