When I list something on Craigslist, it goes to whoever shows up with the money first. I don't wait while people I don't know on CL think about it. Somebody calls and expressed interest in it, then an hour later somebody else calls and wants to buy it, I sell it, having no obligation to the other person.
It could be worse. I just got screwed on Ebay selling a $350 clothing item, with $16 for shipping. It was like new, worn 3 times. I had perfect pics of it and described it as used, but in perfect condition, only worn a few times. So a buyer in San Francisco contacts me, wants to know if I will sell it for less or consider a "discounted sale on Paypal". That latter is a clear violation of Ebay policy, ie trying to take a sale off Ebay to avoid the fees. So, I offered to sell it for $25 less, but on Ebay and with no return. They accepted. Being smart, I made sure to change the Ebay listing to no returns accepted before accepting their offer.
So, I ship it, which cost me $21. They get it, and immediately demand a refund, complaining it was not as shown in the pics and not as described. They claimed it was covered in cat hair and smells like mold/mildew, is so toxic they can't keep it in their apartment. Now, I know this is bogus, but the way Ebay works, they show you a screen that says a buyer is asking for a refund. I looked over the page, which had no choices as to what to do, then clicked next at the bottom, assuming this would take me to a page where I could grant a refund or dispute it, reply, etc. Instead it said, "You've agreed to a return". Nice. So, I guess I could call Ebay and complain, try to get it undone, etc, but at that point, I figured might as well just take it back and be done with it. I had to pay another $13 for return shipping.
So, I get it back, and I took pics of the box before I opened it, and right after. The item is exactly like it was shipped, perfect, not a cat hair on it, smells just like leather, etc. So, I'm out $35 and also have an Ebay strike against me for shipping something that wasn't as described. After processing the return, I was presented with a chance to complain to Ebay about the buyer abusing the Ebay system, which I did. It won't help me, but hopefully it goes in their file and if they pull this again, with some other seller, it could help them with their dispute. If anything, Ebay might be more interested in suspending them for trying to take a sale off Ebay. If I have to do a return again, I'll be real careful with that return screen in the future. If I had not accepted the return without realizing it, I would have asked the buyer to send me pics of the item. After the buyer suggested doing the sale off Ebay, I was suspicious, so I took pics of the item again, just before it went in the shipping box, a pic of the box, etc. Had I been able to dispute it, maybe I would have won, but no way of knowing. A skunk like this could get some cat hair and crap and soil it up, which would be even worse.
Ebay has become a real mess for sellers. As a seller you can't leave negative feedback for a buyer, no matter what they do. I've seen a lot of sellers complaining about ebay policies, high fees, booting them for minor issues, etc.