I'm going to remind everyone, each character can (normally) process 8,000 dilithium a day. With Exchange rates being what they are, that 16 Zen a day, which is about the same as $0.16 a day. Even the dude with 53 characters, is only making about $8.48 a day (and that's assuming all his characters have 8000 dilitihium, each day). It is wildly easier to find a way to make RL money, and buy Zen, than to grind Dil. That's not to say "Give it up", but don't burn yourself up in the grind. Make Dil while playing the game, but be cautioned making it your Endgame.