Agree. Or, to prevent certain people from spamming others' boxes, a "visitor message" list there...this way, since profiles are public, the chances of abusing this would be much slower...

With PMs we would very often start receiving RMT PMs offering gil or linking scam URLs to trick newbies and stuff...which is always important...no URL would be allowed and even the patterns of URL link in a PM would need to be treated as scamming, having the message not delivered and the dude who tried sending it temporaly suspended from forum (until the message is checked by a moderator).