I have a few problems with shipping out a game, hence I've only did it once. Its one thing to ship something to someone you've met in person or have a correspondence with, but another thing to ship to someone you've never met and most likely never will.
I work during the days, and my freetime is very hectic. I cannot wait around during the day for NAVL to pickup between 10am-2pm for instance. If I'm not getting paid for the shipping, and I'm taking 4 hours off of work, I've lost $100 sitting on my ass waiting for the delivery guy.
No matter how much care I take in wrapping and palleting something, there's a fair chance of damage upon arrival. I can't control if something tips over onto the game, or the driver is rough, or it gets banged up being moved from truck to truck.
Then there's the matter of it not working when it arrives. Most reasonable collectors understand that moving a game 2000 miles something is gonna come loose or not have good contact on connectors. I would expect if I had something shipped that I have a 50/50 chance of messing with it when it shows up. Now, take someone who doesn't know much about games or just wanted to play it and not repair it, and you've got a ballistic customer who's demanding money back, demanding "compensation or else", or simply gives you a negative without ever sending you a HEY WHAT GIVES note.
Now, someone shows up to my house and they can plug the machine in and play it, check out the inside, see exactly the condition of the game is before we load it into their truck, its their problem once the tailgate of their truck is closed. Of course I'd offer any help to fix that I could, but this also means they're most likely within driving distance and its not a big deal to go out and take a look at it.
I've had an instance where I brought a machine out to a person sight unseen, they plug it in at their house and its not working, and I was accused of being a thief or dishonest and trying to sell a game that didn't work. I had to tell them that I didn't know it would be damaged in transport and that I'd help to get it fixed. No problem, but I wasn't trying to pass off crap and after that day I'm a firm believer in making them drive their ass to my house if they really want the machine that bad, and put the moving liability on them. Hell, that was just a 100 mile transport and I feel I take much better handling and care than some stoned warehouse kid who is making $13/hr. It was my fault, I didn't check to make sure everything inside was tight, but I had moved the thing a few times without problems so I didn't even think of it.
I'd prefer to make $100-$200 less on the sale then deal with taking a half day off of work and twiddling my thumbs for a shipper to hopefully show up on time... in the long run I'm saving time, money, frustration, heart ache and alot of other giant question marks when dealing with a shipper and far away buyer.