I agree about craigslist, 90% of listings is overpriced. even worse then Ebay.
Then there's so many resellers on it that when a good deal does show up you have to sometimes fight with resellers. I'll contact a seller and agree on a price then minutes later I'm told someone offered more and then there's a bidding war. and the good deal is no more.
One of the deals I had was on that boxed CDi with games i picked up not long ago, I meet up with the guy and offered $100 for everything but he told someone else was offering $250 for it, so I told him to take it. I wasn't paying more then what I offered. So I walked. Then he contacts me a day later trying to get $150 from me, I told him sorry $100 is all I can offer. Then he tried to sell it to me for $110 and I still said $100 is all I can offer. So finally he excepted. Personally I think he was full of BS about his other offers.
Then there's trolls, I hate these jerks. Posting fake adds, garage sales, events and so on.