Okay, so here is my understanding now. Using multiple accounts is not allowed WHEN IT PROVIDES AN ADVANTAGE TO THE SAID PLAYER. In this case an increase in gralat production using multiple accounts. This can result in an increase in prices, similar to that mantises bug incident (bunch of gralats being made, as a result the reselling prices of mantises went down significantly).

Now here is the issue that I see here with the OP's ban. First off, as many have already said, looking at the codes and conduct, it does not warrant a ban for the OP a warning would be better. Since it was a ban, the issue here is that they ASSUMED that he was using a third party program, or macros (idk if macros are 3rd party, but still illegal), which he has proven that he was not.

So the question is did it matter if he was using a macro or manual labor to farm with 3 accounts simultaneously? Would he have be given a warning, instead of a ban, if they knew it was manual labor?