Thank you, and I stand by it, too. Crook's List. Absolutely no doubt. You've been lucky. Every time I've tried to sell anything, I've had nothing but criminals answer using very broken english wanting to send fake postal money orders, etc, etc. It's one of the only places around where you can actually arrange to meet a perfect stranger because he claims to have something you want and now he knows you're bringing a big wad of cash with you. No thank you.
You must be doing something wrong. Always meet in a public location with lots of public eyes. I don't think I've ever had a transaction go bad before. No different than selling online, shipping it out to a total stranger, but now they know you're a high value reseller who has many MacBooks in your house for theft.