Well, I only write in the HP fandom. But normally, if a story is less than 2,000 words, I might or might not get it beta'd. If it's something I feel like I sweated over (and sometimes 2,000 words is a killer for me) I'll get it beta'd. If it's something that I want to have more of a stream-of-consciousness feeling, then no, I might not (I've got a short WIP on Portkey now that's like that). Certainly anything that's bigger and more involved (like a certain Fic of Doom), I'll get beta'd chapter by chapter. I really would like to have my betas more involved in story plotting (so I can bounce ideas off them) but alas, they have RL commitments that make it hard for all of us to chat together. *sigh*