I didn't see any discussion about the cost of driving around town all the time to pick stuff up. Still, depending on his average distance, if he averages three items per day he might not be much worse than a lot of people's average commutes.
The van I drive, a Toyota Sienna, gets pretty good gas mileage . I factor distance/time and what I will be able to sell the item(s) for before pulling the trigger. I listen to music and relax while driving around. I avoid rush hour traffic if at all possible. I drove approx 15-20k miles this past year picking items up and delivering them. It's by far the biggest cost. However, that's pretty much my only overhead, as I sell the items out of our garage/house for now. (I've gotten pretty good at knowing what will sell and what won't, so I stay away from items that I will have to sit on for a while or are difficult to store.)
