If you can really IP ban a PC as opposed to the address it's connecting from, that would be a heck of a lot more effective at controlling bots as they tend to be multi-boxing several hundred accounts on the same PC using modded, stripped-down clients that basically aren't doing anything other then sending the commands to the server needed to play their characters.

I've never seen bots proliferate to the degree they do in XIV in any other MMO, not even F2P ones so SE is clearly doing something really wrong with how they go about banning them.