First off that's a terrible profit for the work. But this brings up some interesting thoughts that I've pondered before.
Why were the people down to just buy this mystery pizza that showed up at their door? Is it just the convenience? So then why don't taco trucks drive around playing music like ice cream trucks? I feel like folks would be all about that.
I imagine (this depends on the neighborhood, of course) many of them felt bad and probably at least gave him some money for a tip for making the drive, as it's not the driver's fault if someone fucked up an order.