So the rule in question is:
3. Yet: You are not allowed to make a multiaccount just to get yourself more donation points, gold, buffs (marriage), etc. To put it short, you should not do so to benefit one character through the other. If you do, punishment includes cancellation of credited donation points and a ban from the server.
Okay, so you can't make a new character for the sole purpose of giving stuff to the other account. Does that mean you can't help the other account at all, or just that the character has to be played, or what? For example, could I give my other account my gold (through the coffers or something) when I'm about to go kill Orochimaru? When my other account is ready to go kill Orochimaru, I'd transfer the gold back to the first account. Would that be against the rules?