Quoted from jarjarisgod:

I thought his post was very clear. He states he doesn't have it yet, expected delivery is November, and buyer pays shipping. Where is the confusion?

Quoted from StevenP:

No, not really. He is selling the game, and when it is built it will be shipped to the buyer. "Selling a slot in line" means he would be selling his order date (at some price) to get earlier delivery, and the buyer would still have to pay for the machine separately. He is selling 100% interest in the machine to be delivered, not just a "spot in line."
The analogy would be waiting in line to buy tickets to a show. Here, the actual tickets are being sold for the asking price, and they can be picked up when they are available at the ticket booth. "Selling your place in line" would be allowing somebody to take your place near the front of the line, where they may get tickets that are better r get them sooner, but still have to pay for the tickets when available.