There's a lot of reasons the PoD option works better than a standard print run, for both the majority of backers as well as the project creator, especially in a small zine scenario such as this.
1. It allows someone who bought the PDF to stick with just PDFs if they don't want to order print copies.
2. It allows people ordering print copies the option to get just one, half of them, all of them, or even none of them when the time comes. They'll still have the PDF but can add on a print copy at any time, even long after the issue has been released.
3. We can offer a much lower price for everyone.
Can you imagine if we had to print ourselves and ship out to everyone? Either the backers or AAW Games would have to take the brunt of the S&H costs which can be extreme for some countries. The extra logistics involved in such a procedure, including having a fulfillment house do the work, add in shipping supplies, and cost to ship and you're talking thousands and thousands of dollars for something that doesn't need to happen, it's essentially adding a bunch of extra steps whereas PoD is one-click print and ship direct to the customer.