I don't think it's a good idea to ban people for using the exploit. I haven't even used it, but I disagree with making people suffer for game balance oversights. Path of Exile for instance basically only bans when people do things that cause server rollbacks (not unintended crafting methods).

Anyways, this bug was known and reported since Week 1, but the devs just suddenly decided to do something about it? It's like they aren't paying attention to the game.