Don't overreact. Really? Here is what Daemon said first:
Hi,
It is indeed a bug. The respawn pattern should not be deterministic. When a vein despawns, it may, or may not respawn afterwards, or another vein may respawn somewhere else.
You could not predict exactly when/where a vein would spawn on retail.
If there are other nodes bugged (mining or herbs), it is an exploit and it needs to be reported on the bugtracker.
Daemon.
Then he further clarified.
About 5 accounts have been banned for exploiting this bug, that is fixed now.
These accounts were doing it at an "industrial level" (gathering these same nodes way more than 500 times a week !) and thus gathering a lot of gold/items in a very little period of time.
Add both of these together and the story you get is: "These 5 nolifers found what they thought was a good grid spot and farmed it, much like others farm DM East/North or whatever their poison is. However, we decided that the predictability we coded was a mistake and the spawn should be more random and the grind less profitable. Thus we banned these farmers."
If this is NOT the story then for the love of god tell us the real story, with details. Because all your reassurances doesn't do shit unless you tell us what in your view went down. GM's keeping secret their detection methods for hacks and bots make sense, keeping secret what non-bot/non-hack in-game actions can get you banned doesn't. AT ALL.
And remember, knowing that the nodes are on a timer =/= knowing that it isn't intended. Tons of stuff in wow spawn on timer, so coming across that in the world really doesn't raise any red flags.