You're still hyper fixating on one single point. And I'm not a businessman. I imagine businesses never do one thing for one reason like software functions.
Bankers can tell a lot from a security standpoint based on seemingly frivolous data. Maybe it's the same logic here. If you end every day swelling exactly XX0 products, something is amiss. It at least prompts a deeper investigation, since running through weeks of receipt/data takes more time pre-computer.
Pre-digital calculator salesmen? Time is money and being able to do a quick mental math can be helpful before doing a more detailed inventory
>you could then just divide by the price, you don't need to coerce the total into being a tally mod 100.
That's why they gave more than one reason. Why laser focus on criticizing a single one?