I guess I just naturally extend people some common courtesy and I expect the same in return.
I'm the same, it often disappoints me because I have the (apparently weird) expectation that people will have common courtesy...
So yeah, has anyone else's Craigslist experiences been similar to that, or are people in my neck of the world just extra "special"? 
I sell quite often on Kijiji (same as Craigslist, but more popular in my area), and buy from time to time too. I've had many more good experiences than bad ones, but the bad ones really stink. This summer, when I was looking for a PS Vita, I saw one complete in box with 4 or 5 games, and it had a screen protector and a protective case, all for 140$. The ad was up since over a month, but I took the chance and e-mailed the guy. Turns out he still had it! ... and that's also the last I heard of him. I answered his e-mail right away asking when I could meet him and that I could go straight to his home if he wanted to, then 2 days later I ping'ed him to ask again, then a week later I said I was still interested... never ever heard back. That puzzled me.
Why take the time to list something if in the end you won't even bother answering?
As for selling, people are still total asshats haha. Sometimes even more, I guess. Some dude wanted me to take a 1-hour subway ride (2-hours if you include me coming back to my house afterward), which would have cost me $6 too, to sell him a $10 item. And he was mad when I said no.
Tsk.
