"I will consider other offers but I will not respond to any low-ball offers, I will not piece out the collection or only sell the rare and desirable games, and I will not haggle."
Um...
I've got a few things listed and nearly every reply is the same. "What's the lowest you'll go on it?" That's not how price negotiation works. I list at $X, you offer a specific amount, then we go from there.