It's very impressive that he's able to earn so much money and support his family via Craigslist, but I can't help but think about how useful (or not useful, really) his job is for the overall economy. Basically, he's another middleman - buying goods for a low price and selling them higher. Without him in the picture, buyers could have purchased their items for less and saved money. I just don't see how this job adds…
Without him in the picture, buyers could have purchased their items for less and saved money.
Without him in the picture, buyers might not have found the items and wouldn't have the benefit they think buying the items at all will give them. He's doing a major public service.