Removing the perk was absolutely not about the cost of the pizza which was trivial, or the extra productivity, it was about the few jerks abusing it. Of course, they could have bought 5X more pizza, and then the jerks would have walked out with 5 pizza boxes instead of one.

Same mentality is why we can't leave a basket of unattended candy outside the house on Halloween, for Trick-Or-Treaters to share: Inevitably someone will just take the whole basket. It's not about the cost of the candy, it's about not enabling jerks.

You can think about the company spending too little on pizza or you can think about people being selfish jerks to each other.

When in your local park there are no benches to sit because half of them were dismantled and sold for scrap (true story) you can think how government spends too little on park maintenance or policing, or you can think how people are being selfish jerks to each other.