I see both sides of the arguments. I found Menace's original sales thread before anybody had posted about buying copies. I contemplated buying one for myself, but decided not to.
I wouldn't have a problem with what he was doing, but it does seem unfair for people attending the con. I understand that the CBDLF would have potentially made more by selling 200 copies on the boards, but to be fair to the people actually attending the con, maybe they could have let Menace buy any leftovers to sell for the $30 on these boards. That way none would be taken away from potential buyers going to the con and the CBDLF would have made more money on the remaining comics.