Although i can understand someone being annoyed and somewhat offended at a low bid, from what ive read from other posts is that a potential buyer is not going to start too close the the price that their willing to pay, so as to leave room for negotiations.
By the way i dont know the prices of these particular domains (LLLL) but i think steady negotiation in any potential deal or at least a friendly but to the point message may be more ideal in many cases.
I understand that people dont have time to waste and can often end up disappointed when something leads to nothing but i think taking the polite approach and not taking a low offer too personally may be best.
Its absolutely not my business what anyone offers a domain for, but i think in long term and reputation and feel that handling each situation accordingly and calmly is important.