Interesting. But wouldn't it be better to buy on ebay and sell on craigslist? That way you don't have to drive around to pick up stuff and people come to your house to get things so you don't have to mail it out.
In places like ebay the sellers are a tad more experienced and they have more exposure to the "market price" so it's harder to get a better deal. You could still get a small deal and try to sell for an inflated price on craigslist, but I'm of the opinion that it's just easier to find buyers who will buy at the market price on ebay rather than buyers who will buy for an expensive price on craigslist. Even more so with specialty / collector style items.