There is an art to "low balling" if you really want to start a negotiation.
If you are polite and show respect, you will typically actually engage the seller in a discussion that could evolve into a negotiation.
If you are rude, pushy, nasty and/or mean, you will typically get an argument or even worse ignored.
In the past, I have often made "low ball" offers because I felt that I could get the game for cheaper if I tried.
My best example is from May 2007. There was a local CL ad for a Bally Fireball. The seller wanted $1,600 but did not provide adequate pictures in the ad.
I sent them an email stating that I was interested at $800. I also stated that I understood that my offer was significantly lower than their asking price and I did not really expect them to entertain my offer now. However, should circumstances change and they decide to consider lower offers, I asked them to consider mine.
I wished them well and left my phone number.
I received a pleasant email stating that my offer was lower than they cared to accept, but they thanked me for sending them the offer.
About 2 weeks later, I get a phone call at 8am on a Saturday asking me if I was still interested in the game. I told her that I was, but my offer was still $800. The owner told me that I could have it for $800 if I could pick it up by Noon. I told her that I would be right over! So I ended up with a working Bally Fireball for $800.
Some may decry my "low ball" offer since it was 50% less than the seller's asking price. But in the end, it was the seller who made a decision regarding their sales price.
I have used this approach many times. Only a few worked, but the few that did were well worth the attempt.
Marcus