I don't really see the point of doing that. As long as they update it, it doesn't really make a difference. I'ts a minor inconvenience, but making it a rule means we have to enforce it, and I don't feel comfortable telling people how they have to manage their own threads as long as they're readable. As long as the updated version is easy to access, it's fine with me. Besides, you should read or at least skim the thread before rating, so it should be seen by you. Oh, and their is the possessive form of there/their/they're, not there.
PS: If I ignore your suggestion the first time, that doesn't mean repost it. That's just a tad bit irritating and doesn't make it more likely of being taken. Quite the opposite.