The idea behind the magazine was that I calculated we could run it in a way that half the month could be spent on that and the other half on working on the software we wanted to build. I'm pretty sure that play would have taken forever to execute.
So we actually really needed that $18K that YC gave us AND the 3 dedicated months to blow everything off and only work on the software. Very different times back then.
Having the choice to not take on debt and work with people who'd done it before made way more sense especially considering we hadn't written a line of code when we got into YC and had no idea what we were doing. YC paid us to start our company and gave us amazing advice that kept us from making a lot of bad decisions. The loan option isn't exactly a great deal by comparison.
Plus, we were not from Silicon Valley at the time. We quit our jobs because we hated working in a fucking cubicle. It was probably irrational, but easy for some people was completely unacceptable to us.