I recently told a guy I don't do discounts on shipping because that's just more time out of my day and he got really huffy about it, but then 10 minutes later someone else asked if they could show up in an hour with cash and it was gone. I enjoyed telling the first guy.
This reminds me of a time I was trying to buy a car. I had no good options at the start, but I found one that was okay - aka affordable. Test drove it, okay. Guy felt a little weird, but meeting a stranger. He agreed I could take it to my mechanic on Saturday, so we met up and I drove with him in the passenger seat. Mechanic gave it a clear, I made an offer below asking and he accepted.
But.
He said he wouldn't sign a contract while Mercury was in retrograde. Yes, this should have been my first clue, but he meant "not until Tuesday" and it was Saturday. And he was a writer on a successful show, so I figured okay - gives me time to get everything good to go.
I followed up on Monday asking about going halfsies on the new tires I'd forgot the guy said were needed. Never heard anything until Tuesday at 4pm when he told me he sold the car that morning to someone for full asking. "Good luck!"
No apology, no fuck you - though I guess the situation was that. I was SOOOOO pissed that I had done all this work and wasted all this time and had an agreed-upon verbal deal for someone to pull that shit. He *should* have told me he had a full-price offer and given me the chance to come up.
I get one or two inquiries about toys for sale is not the same thing, but if I'm talking to someone about an item and they sell it to someone else I don't appreciate that. If it's listed and you haven't purchased it and someone gets it, that's tough shit, but if I'm actively messaging in good faith about it and the person doesn't give me a chance to counter - not a fan of that. The in good faith is key.