I certainly understand the OP's frustration. I've bought and sold countless items off CL, cars, trucks, motorcycles, et cetera and every time I list something for sale I take a deep breath and mutter "here goes..", as I too don't like the first words out of a perspective buyer's mouth to be "what's the lowest you'll take".
I bought my 74 tii from a CL add last July. The price was mid thirties, I responded at the three week mark. I was familiar with that very car, as I recognized that it was owned by a good friend who had it from the late nineties to maybe 2004. I'd driven it back then, she drove beautifully as well as looked excellent, and still does. I contacted the seller, had a nice long chat with him. I called him a few days later (ad was still up) and asked if he was at all flexible with the price. He asked what I had in mind, and I told him high twenties. He said come on over, we could talk.
Two days later the car was mine, fair deal for both parties.