Guild Wars 2

Place a mute on an account that has received n reports for spamming for x hours.

The hope is that this could clear up the chat in public areas, letting minor offenses by and shutting down gold sellers spamming in chat.

Indeed an oversight: reporting an account for spamming should, at least, also add that account to a temporary (until log-out) block list. Another game (Rift IIRC) did this and it was nice. Otherwise, as stated in-game, many just ignore rather than report.