First this wasn't a single person buying these, this was mostly likely a corporation for some kind of party, which makes it worst. If you can afford 1400 dollars in pizza, you can at the very least afford a hundred dollar tip (that's not even 10 percent).
Second of all, the guy had to load all the pizzas into his own car, then take them all to this business, while getting less than minimum wage. That's 85 pizzas into his own personal car. He could have done several more deliveries and got more tips, in the time it would have taken him to do this.
Third of all, most likely you people (the one's against this) have never had to do this kind of work and can't relate. You all are "uni" students that have had life funded by mum/dad. When you actually have to work for a living you'll understand how the treatment of this is wrong.