http://us.battle.net/wow/en/forum/topic/4253901921?page=5#85
just an example. This is not the first time I've seen people report detail of the exploit, be it fun or gold making, etc on Blizz forum. They often go with the claim they 'discovered' it on their own, 'found' it via Google, etc but in fact may be someone who check this forum or other exploit forum and leaking details out on Blizz forum.
The exploit involving the lockbox is increased chance of finding BOE purple item they can sell for over 100kg so by buying as many lockboxes, then using hearth trick to reset the content every time.
Why can't the good exploit remain a secret? Like the infamous dupe exploit that remained a secret to us.