You meet all kinds of people in the reseller world. The small time businessman, the hoarders, the paranoid schizophrenic, the hobbyists. I have actually met a paranoid schizophrenic who was a buyer, and he was a little scary. He had been posted to Afghanistan and was suffering from PTSD. It didn't make him any less scary though. I also met a huge Russian guy named Igor, who could bend me in two without breaking into a sweat and was one of the nicest hobbyists I have met.
The flippers know that if their timing is right, you just might accept a lowball price on a firm sale. So they are playing a numbers game. Send out a swath of emails to see if there is any chance of a bargain to a whole bunch of sellers, and meanwhile, they research if they can make anything off of it. If they conclude there is no market, they ignore your response. Or they found something better. I'm getting that quite a bit now. The longer the delay between contact and pickup, the less likely it will happen. I don't consider anything sold until the money and merchandise change hands. And for that reason, I don't hold anything without a deposit.
I have a GT Triple Triangle Karakoram hard tail mountain bike for sale and last week, some guy expressed interest in it. After a few back and forths, he asked me to deliver to him. I said sure, if you will send me a $60 deposit, I'll bring it to you. Then I told him I'm sorry to have to ask for a deposit, but I've had people ask for delivery before, and then try to renegotiate the price. He said that's not going to happen, as he won't send a deposit. I said no problem, if he's ever able to make it out here, I'll drive him back home with the bike(bike needs some work). That was the end of that. It is what it is these days. The world has changed and it is best to recognize that.