Take a look at this suggested edit. It was rejected as spam/vandalism, but was suggested by an anonymous user. Should we temporarily ban edits from an IP address that has an edit rejected as spam/vandalism? Maybe flag the edit and if a moderator deems it spam/vandalism, then ban?
Maybe ban edits from that IP address, but only for anonymous users. There are many users who share an IP address and I don't think we should interfere with their activity because of one bad (anonymous) egg.