I agree, and that's why I designed
DragonList to have a simple webmaster page that clearly states whether the rules have been updated since the submitter's last login. Changes to the rules page are detected automatically.
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But it is amazing how many submitters fail to read the rules even if the most recent update date is clearly displayed. I'm sure I'm as guilty of this as anyone. A submitting frenzy tends to result in glazed eyes and a frazzled brain. Especially the dreaded "I've updated the recips again" - when you change your recips every five minutes, expect your submitters to become blind to the notices.